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List of counties in Colorado

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Map of Colorado counties, labelled

Colorado counties

This is a list of the 64 counties of the U.S. State of Colorado. The counties of Colorado are important components of government since the state has no secondary civil subdivisions such as townships. Two counties, the City and County of Denver and the City and County of Broomfield, have consolidated city and county governments.

Colorado countiesEdit

The FIPS county code is the five-digit Federal Information Processing Standard (FIPS) code which uniquely identifies counties and county equivalents in the United States. The three-digit number is unique to each individual county within a state, but to be unique within the entire United States, it must be prefixed by the state code. This means that, for example, while Adams County, Colorado is 001, Belknap County, New Hampshire and Alachua County, Florida are also 001. To uniquely identify Adams County, Colorado, one must use the state code of 08 plus the county code of 001; therefore, the unique nationwide identifier for Adams County, Colorado is 08001. The links in the column FIPS County Code are to the Census Bureau Info page for that county.[1]

The 64 Counties of the State of Colorado
County
FIPS Code
[1]
County Seat
[2]
Created
[3]
Formed from
[4]
Origin of name
Population
[3][5]
Area
[6]
Map
[3] 
Adams County 001 Brighton 1902-11-15 Split from Arapahoe County. Named in honor of Alva Adams, the fifth Governor of the State of Colorado. &&&&&&&&&0414338.&&&&&0414,338 &&&&&&&&&&&03062.1200003,062.12 sq mi
(&&&&&&&&&&&07931.&&&&&07,931 km2)
State map highlighting Adams County
Alamosa County 003 Alamosa 1913-03-08 Split from Costilla County and Conejos County counties. Named for the cottonwood trees which grow along the river and streams of the area. Alamosa is a Spanish word for a cottonwood grove. &&&&&&&&&&015225.&&&&&015,225 &&&&&&&&&&&01873.1000001,873.10 sq mi
(&&&&&&&&&&&04851.&&&&&04,851 km2)
State map highlighting Alamosa County
Arapahoe County 005 Littleton 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Renamed South Arapahoe County for five months from 1902-11-15, to 1903-04-11. Named for predecessor Arapahoe County, which in turn was named for the Arapaho Native American tribe. &&&&&&&&&0537197.&&&&&0537,197 &&&&&&&&&&&02083.4000002,083.40 sq mi
(&&&&&&&&&&&05396.&&&&&05,396 km2)
State map highlighting Arapahoe County
Archuleta County 007 Pagosa Springs 1885-04-14 Split from Conejos County. Named in honor of Colorado State Senator Antonio D. Archuleta. &&&&&&&&&&012386.&&&&&012,386 &&&&&&&&&&&03508.2200003,508.22 sq mi
(&&&&&&&&&&&09086.&&&&&09,086 km2)
State map highlighting Archuleta County
Baca County 009 Springfield 1889-04-16 Split from Las Animas County. Named in honor of the prominent Baca family of Trinidad, members of which had settled early in the area. &&&&&&&&&&&04017.&&&&&04,017 &&&&&&&&&&&06626.4300006,626.43 sq mi
(&&&&&&&&&&017162.&&&&&017,162 km2)
State map highlighting Baca County
Bent County 011 Las Animas 1870-02-11 Split from Huerfano County and former Cheyenne and Arapaho tribal land. Named in honor of frontier trader William Bent. &&&&&&&&&&&05551.&&&&&05,551 &&&&&&&&&&&03991.3600003,991.36 sq mi
(&&&&&&&&&&010338.&&&&&010,338 km2)
State map highlighting Bent County
Boulder County 013 Boulder 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for the abundance of granite boulders in the area. &&&&&&&&&0282304.&&&&&0282,304 &&&&&&&&&&&01917.8300001,917.83 sq mi
(&&&&&&&&&&&04967.&&&&&04,967 km2)
State map highlighting Boulder County
Broomfield County 014 Broomfield 2001-11-15 Split from Boulder, Adams, Jefferson, and Weld counties and reorganized as a consolidated city and county. Named for the broom corn that was formerly grown in the area. &&&&&&&&&&045116.&&&&&045,116 &&&&&&&&&&&&&086.93000086.93 sq mi
(&&&&&&&&&&&&0225.&&&&&0225 km2)
State map highlighting Broomfield County
Chaffee County 015 Salida 1879-02-10 Split from Carbonate County. Named in honor of Jerome Bunty Chaffee, a U.S. Senator from Colorado. &&&&&&&&&&016918.&&&&&016,918 &&&&&&&&&&&02626.5500002,626.55 sq mi
(&&&&&&&&&&&06803.&&&&&06,803 km2)
State map highlighting Chaffee County
Cheyenne County 017 Cheyenne Wells 1889-03-25 Split from Elbert and Bent counties. Named for the Cheyenne Native American tribe. &&&&&&&&&&&01906.&&&&&01,906 &&&&&&&&&&&04615.&900004,615.09 sq mi
(&&&&&&&&&&011953.&&&&&011,953 km2)
State map highlighting Cheyenne County
Clear Creek County 019 Georgetown 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for Clear Creek which runs through the county. &&&&&&&&&&&09130.&&&&&09,130 &&&&&&&&&&&01027.&&&&&01,027.00 sq mi
(&&&&&&&&&&&02660.&&&&&02,660 km2)
State map highlighting Clear Creek County
Conejos County 021 Conejos 1861-11-01 Guadalupe County, one of the 17 original counties of the Territory of Colorado, was renamed Conejos County after six days on 1861-11-07. Named for the cottontail rabbits in the area. Conejos is a Spanish word for rabbits. &&&&&&&&&&&08406.&&&&&08,406 &&&&&&&&&&&03341.6600003,341.66 sq mi
(&&&&&&&&&&&08655.&&&&&08,655 km2)
State map highlighting Conejos County
Costilla County 023 San Luis 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for the Costilla River. Costilla is a Spanish word meaning either little rib or furring timber. &&&&&&&&&&&03378.&&&&&03,378 &&&&&&&&&&&03184.&700003,184.07 sq mi
(&&&&&&&&&&&08247.&&&&&08,247 km2)
State map highlighting Costilla County
Crowley County 025 Ordway 1911-05-29 Split from Otero County. Named in honor of Colorado State Senator John H. Crowley. &&&&&&&&&&&05386.&&&&&05,386 &&&&&&&&&&&02072.6800002,072.68 sq mi
(&&&&&&&&&&&05368.&&&&&05,368 km2)
State map highlighting Crowley County
Custer County 027 Westcliffe 1877-03-09 Split from Fremont County. Named in honor of George Armstrong Custer, the U.S. Army colonel defeated at the Battle of Little Bighorn. &&&&&&&&&&&03926.&&&&&03,926 &&&&&&&&&&&01914.6200001,914.62 sq mi
(&&&&&&&&&&&04959.&&&&&04,959 km2)
State map highlighting Custer County
Delta County 029 Delta 1883-02-11 Split from Gunnison County. Named for the town of Delta located at the delta of the Uncompahgre River. &&&&&&&&&&030401.&&&&&030,401 &&&&&&&&&&&02977.&500002,977.05 sq mi
(&&&&&&&&&&&07711.&&&&&07,711 km2)
State map highlighting Delta County
Denver County 031 Denver 1902-11-15 The original Arapahoe County Seat was split from Arapahoe County and reorganized as a consolidated city and county. Named in honor of James William Denver, a Governor of the Territory of Kansas. &&&&&&&&&0566974.&&&&&0566,974 &&&&&&&&&&&&0403.150000403.15 sq mi
(&&&&&&&&&&&01044.&&&&&01,044 km2)
State map highlighting Denver County
Dolores County 033 Dove Creek 1881-03-04 Split from Ouray County. Named for the Dolores River, which was originally named el Rio de Nuestra Senora de los Dolores, which is Spanish for the River of our Lady of Sorrows. &&&&&&&&&&&01911.&&&&&01,911 &&&&&&&&&&&02789.2200002,789.22 sq mi
(&&&&&&&&&&&07224.&&&&&07,224 km2)
State map highlighting Dolores County
Douglas County 035 Castle Rock 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of U.S. Senator Stephen Arnold Douglas of Illinois. &&&&&&&&&0263621.&&&&&0263,621 &&&&&&&&&&&02181.5500002,181.55 sq mi
(&&&&&&&&&&&05650.&&&&&05,650 km2)
State map highlighting Douglas County
Eagle County 037 Eagle 1883-02-11 Split from Summit County. Named for the Eagle River, which in turn was named for the abundance of eagles in the area. &&&&&&&&&&&04985.&&&&&04,985 &&&&&&&&&&&04404.9400004,404.94 sq mi
(&&&&&&&&&&011409.&&&&&011,409 km2)
State map highlighting Eagle County
El Paso County 039 Colorado Springs 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for Ute Pass. El paso is a Spanish exression for the pass. &&&&&&&&&0576884.&&&&&0576,884 &&&&&&&&&&&05513.&500005,513.05 sq mi
(&&&&&&&&&&014279.&&&&&014,279 km2)
State map highlighting El Paso County
Elbert County 041 Kiowa 1874-02-02 Split from Douglas County. Named in honor of Samuel Hitt Elbert, the sixth Governor of the Territory of Colorado. &&&&&&&&&&023181.&&&&&023,181 &&&&&&&&&&&04789.&900004,789.09 sq mi
(&&&&&&&&&&012404.&&&&&012,404 km2)
State map highlighting Elbert County
Fremont County 043 Canon City 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of John Charles Frémont, the explorer, U.S. Army general, and U.S. Senator from California. &&&&&&&&&&048010.&&&&&048,010 &&&&&&&&&&&03970.6700003,970.67 sq mi
(&&&&&&&&&&010284.&&&&&010,284 km2)
State map highlighting Fremont County
Garfield County 045 Glenwood Springs 1883-02-10 Split from Summit County. Named in honor of James Abram Garfield, the twentieth President of the United States. &&&&&&&&&&051908.&&&&&051,908 &&&&&&&&&&&07661.7800007,661.78 sq mi
(&&&&&&&&&&019844.&&&&&019,844 km2)
State map highlighting Garfield County
Gilpin County 047 Central City 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of William Gilpin, the first Governor of the Territory of Colorado. &&&&&&&&&&&05042.&&&&&05,042 &&&&&&&&&&&&0388.880000388.88 sq mi
(&&&&&&&&&&&01007.&&&&&01,007 km2)
State map highlighting Gilpin County
Grand County 049 Hot Sulphur Springs 1874-02-02 Split from Summit County. Named for the Grand River which was renamed the Colorado River in 1921. &&&&&&&&&&013406.&&&&&013,406 &&&&&&&&&&&04839.4600004,839.46 sq mi
(&&&&&&&&&&012534.&&&&&012,534 km2)
State map highlighting Grand County
Gunnison County 051 Gunnison 1877-03-09 Split from Lake County. Named in honor of John Williams Gunnison, the U.S. Army captain who explored the region. &&&&&&&&&&014331.&&&&&014,331 &&&&&&&&&&&08441.3400008,441.34 sq mi
(&&&&&&&&&&021863.&&&&&021,863 km2)
State map highlighting Gunnison County
Hinsdale County 053 Lake City 1874-02-10 Split from Lake, Conejos, and Costilla counties. Named in honor of George Aaron Hinsdale, a Lieutenant Governor of the Territory of Colorado. &&&&&&&&&&&&0819.&&&&&0819 &&&&&&&&&&&02909.4700002,909.47 sq mi
(&&&&&&&&&&&07535.&&&&&07,535 km2)
State map highlighting Hinsdale County
Huerfano County 055 Walsenburg 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for the Huerfano River. Huerfano is a Spanish word meaning orphan. &&&&&&&&&&&07808.&&&&&07,808 &&&&&&&&&&&04124.2200004,124.22 sq mi
(&&&&&&&&&&010682.&&&&&010,682 km2)
State map highlighting Huerfano County
Jackson County 057 Walden 1909-05-05 Split from Larimer County. Named in honor of Andrew Jackson, the seventh President of the United States. &&&&&&&&&&&01406.&&&&&01,406 &&&&&&&&&&&04195.1300004,195.13 sq mi
(&&&&&&&&&&010865.&&&&&010,865 km2)
State map highlighting Jackson County
Jefferson County 059 Golden 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for its extralegal predecessor county, Jefferson County, which in turn was named in honor of Thomas Jefferson, the author of the Declaration of Independence and the third President of the United States. &&&&&&&&&0526994.&&&&&0526,994 &&&&&&&&&&&02001.6700002,001.67 sq mi
(&&&&&&&&&&&05184.&&&&&05,184 km2)
State map highlighting Jefferson County
Kiowa County 061 Eads 1889-04-11 Split from Bent County. Named for the Kiowa Native American tribe. &&&&&&&&&&&01413.&&&&&01,413 &&&&&&&&&&&04625.4600004,625.46 sq mi
(&&&&&&&&&&011980.&&&&&011,980 km2)
State map highlighting Kiowa County
Kit Carson County 063 Burlington 1889-04-11 Split from Elbert County. Named in honor of Christopher Houston "Kit" Carson, the famous frontier scout and soldier. &&&&&&&&&&&07590.&&&&&07,590 &&&&&&&&&&&05600.6700005,600.67 sq mi
(&&&&&&&&&&014506.&&&&&014,506 km2)
State map highlighting Kit Carson County
La Plata County 065 Durango 1874-02-10 Split from Lake and Conejos counties. Named for the many silver deposits in the area. La plata is a Spanish expression for the silver. &&&&&&&&&&047936.&&&&&047,936 &&&&&&&&&&&04404.1300004,404.13 sq mi
(&&&&&&&&&&011407.&&&&&011,407 km2)
State map highlighting La Plata County
Lake County 067 Leadville 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Renamed Carbonate County for two days from 1879-02-08, to 1879-02-10. Named for the Twin Lakes. &&&&&&&&&&&07814.&&&&&07,814 &&&&&&&&&&&&0993.400000993.40 sq mi
(&&&&&&&&&&&02573.&&&&&02,573 km2)
State map highlighting Lake County
Larimer County 069 Fort Collins 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of William Larimer, a pioneer entrepreneur. &&&&&&&&&0276253.&&&&&0276,253 &&&&&&&&&&&06816.2000006,816.20 sq mi
(&&&&&&&&&&017654.&&&&&017,654 km2)
State map highlighting Larimer County
Las Animas County 071 Trinidad 1866-02-09 Split from Huerfano County. Named for the Animas River, which was originally named el Rio de las Animas Perdidas, which is Spanish for the River of the Souls in Purgatory. &&&&&&&&&&015564.&&&&&015,564 &&&&&&&&&&012362.71000012,362.71 sq mi
(&&&&&&&&&&032019.&&&&&032,019 km2)
State map highlighting Las Animas County
Lincoln County 073 Hugo 1889-04-11 Split from Elbert and Bent counties. Named in honor of Abraham Lincoln, the sixteenth President of the United States. &&&&&&&&&&&05458.&&&&&05,458 &&&&&&&&&&&06695.6500006,695.65 sq mi
(&&&&&&&&&&017342.&&&&&017,342 km2)
State map highlighting Lincoln County
Logan County 075 Sterling 1887-02-25 Split from Weld County. Named in honor of John Alexander Logan, a U.S. Army general and U.S. Senator from Illinois. &&&&&&&&&&020780.&&&&&020,780 &&&&&&&&&&&04779.3300004,779.33 sq mi
(&&&&&&&&&&012378.&&&&&012,378 km2)
State map highlighting Logan County
Mesa County 077 Grand Junction 1883-02-14 Split from Gunnison County. Named for the mesa formations which are widespread through the area. &&&&&&&&&0134189.&&&&&0134,189 &&&&&&&&&&&08665.2900008,665.29 sq mi
(&&&&&&&&&&022443.&&&&&022,443 km2)
State map highlighting Mesa County
Mineral County 079 Creede 1893-03-27 Split from Hinsdale, Rio Grande, and Saguache counties. Named from the plentiful mineral deposits found in the area. &&&&&&&&&&&&0929.&&&&&0929 &&&&&&&&&&&02274.4200002,274.42 sq mi
(&&&&&&&&&&&05891.&&&&&05,891 km2)
State map highlighting Mineral County
Moffat County 081 Craig 1911-02-27 Split from Routt County. Named in honor of railroad pioneer David H. Moffat. &&&&&&&&&&013680.&&&&&013,680 &&&&&&&&&&012317.62000012,317.62 sq mi
(&&&&&&&&&&031902.&&&&&031,902 km2)
State map highlighting Moffat County
Montezuma County 083 Cortez 1889-04-16 Split from La Plata County. Named in honor of Aztec leader Moctezuma II. Ruins in the area were originally thought to have been of Aztec origin. &&&&&&&&&&025217.&&&&&025,217 &&&&&&&&&&&05272.7000005,272.70 sq mi
(&&&&&&&&&&013656.&&&&&013,656 km2)
State map highlighting Montezuma County
Montrose County 085 Montrose 1883-02-11 Split from Gunnison County. Named for the town of Montrose, which in turn was probably named from the novel A Legend of Montrose, published in 1819 by Walter Scott. &&&&&&&&&&038559.&&&&&038,559 &&&&&&&&&&&05818.2100005,818.21 sq mi
(&&&&&&&&&&015069.&&&&&015,069 km2)
State map highlighting Montrose County
Morgan County 087 Fort Morgan 1889-02-19 Split from Weld County. Named for old Fort Morgan, which in turn was named in honor of U.S. Army Colonel Christopher A. Morgan. &&&&&&&&&&028109.&&&&&028,109 &&&&&&&&&&&03350.9900003,350.99 sq mi
(&&&&&&&&&&&08679.&&&&&08,679 km2)
State map highlighting Morgan County
Otero County 089 La Junta 1889-03-25 Split from Bent County. Named in honor of Miguel A. Otero of the prominent Otero family of the Southwest. &&&&&&&&&&019452.&&&&&019,452 &&&&&&&&&&&03283.2300003,283.23 sq mi
(&&&&&&&&&&&08504.&&&&&08,504 km2)
State map highlighting Otero County
Ouray County 091 Ouray 1877-01-18 Split from Hinsdale and Lake counties. Renamed Uncompaghre County for four days from 1883-02-27, to 1883-03-02. Named in honor of Ouray, a Ute Native American leader. &&&&&&&&&&&04307.&&&&&04,307 &&&&&&&&&&&01404.5600001,404.56 sq mi
(&&&&&&&&&&&03638.&&&&&03,638 km2)
State map highlighting Ouray County
Park County 093 Fairplay 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for South Park which occupies most of the county. &&&&&&&&&&017157.&&&&&017,157 &&&&&&&&&&&05722.2100005,722.21 sq mi
(&&&&&&&&&&014820.&&&&&014,820 km2)
State map highlighting Park County
Phillips County 095 Holyoke 1889-03-27 Split from Logan County. Named in honor of R.O. Phillips, secretary of the Lincoln Land Company. &&&&&&&&&&&04601.&&&&&04,601 &&&&&&&&&&&01782.7100001,782.71 sq mi
(&&&&&&&&&&&04617.&&&&&04,617 km2)
State map highlighting Phillips County
Pitkin County 097 Aspen 1881-02-23 Split from Gunnison County. Named in honor of Frederick Walker Pitkin, the second Governor of the State of Colorado. &&&&&&&&&&014798.&&&&&014,798 &&&&&&&&&&&02513.2400002,513.24 sq mi
(&&&&&&&&&&&06509.&&&&&06,509 km2)
State map highlighting Pitkin County
Prowers County 099 Lamar 1889-04-11 Split from Bent County. Named in honor of John W. Prowers, a pioneer of the Arkansas River valley. &&&&&&&&&&013776.&&&&&013,776 &&&&&&&&&&&04261.4900004,261.49 sq mi
(&&&&&&&&&&011037.&&&&&011,037 km2)
State map highlighting Prowers County
Pueblo County 101 Pueblo 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for historic town of Pueblo. Pueblo is a Spanish word meaning village or people. &&&&&&&&&0152912.&&&&&0152,912 &&&&&&&&&&&06207.6000006,207.60 sq mi
(&&&&&&&&&&016078.&&&&&016,078 km2)
State map highlighting Pueblo County
Rio Blanco County 103 Meeker 1889-03-25 Split from Garfield County. Named for the White River, which was originally named el Rio Blanco in Spanish. &&&&&&&&&&&06180.&&&&&06,180 &&&&&&&&&&&08355.9100008,355.91 sq mi
(&&&&&&&&&&021642.&&&&&021,642 km2)
State map highlighting Rio Blanco County
Rio Grande County 105 Del Norte 1874-02-10 Split from Costilla County and Conejos County counties. Named for the Rio Grande, which flows through the area. &&&&&&&&&&012006.&&&&&012,006 &&&&&&&&&&&02364.9100002,364.91 sq mi
(&&&&&&&&&&&06125.&&&&&06,125 km2)
State map highlighting Rio Grande County
Routt County 107 Steamboat Springs 1877-01-29 Spilt from Grand County. Named in honor of John Long Routt, the first Governor of the State of Colorado. &&&&&&&&&&021580.&&&&&021,580 &&&&&&&&&&&06117.8400006,117.84 sq mi
(&&&&&&&&&&015845.&&&&&015,845 km2)
State map highlighting Routt County
Saguache County 109 Saguache 1966-12-29 Split from Lake and Costilla counties. Name comes from a Ute language word meaning "blue earth" or "water at blue earth". &&&&&&&&&&&07006.&&&&&07,006 &&&&&&&&&&&08205.9100008,205.91 sq mi
(&&&&&&&&&&021253.&&&&&021,253 km2)
State map highlighting Saguache County
San Juan County 111 Silverton 1876-01-31 Split from Lake County. Named for the San Juan River and San Juan Mountains, which in turn were named for Saint John the Evangelist. &&&&&&&&&&&&0578.&&&&&0578 &&&&&&&&&&&01007.4800001,007.48 sq mi
(&&&&&&&&&&&02609.&&&&&02,609 km2)
State map highlighting San Juan County
San Miguel County 113 Telluride 1883-03-02 Split from San Juan County. Named for the San Miguel River and San Miguel Mountains, which in turn were named for Saint Michael the Archangel. &&&&&&&&&&&07143.&&&&&07,143 &&&&&&&&&&&03343.&500003,343.05 sq mi
(&&&&&&&&&&&08658.&&&&&08,658 km2)
State map highlighting San Miguel County
Sedgwick County 115 Julesburg 1889-04-09 Split from Logan County. Named for Fort Sedgwick, which, in turn, was named for U.S. Army General John Sedgwick. &&&&&&&&&&&02467.&&&&&02,467 &&&&&&&&&&&01421.4700001,421.47 sq mi
(&&&&&&&&&&&03682.&&&&&03,682 km2)
State map highlighting Sedgwick County
Summit County 117 Breckenridge 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named for the many high mountain summits in the area. &&&&&&&&&&025399.&&&&&025,399 &&&&&&&&&&&01602.9800001,602.98 sq mi
(&&&&&&&&&&&04152.&&&&&04,152 km2)
State map highlighting Summit County
Teller County 119 Cripple Creek 1899-03-23 Split from El Paso and Fremont counties. Named in honor of Henry Moore Teller, a U.S. Senator from Colorado and United States Secretary of the Interior. &&&&&&&&&&022243.&&&&&022,243 &&&&&&&&&&&01446.7100001,446.71 sq mi
(&&&&&&&&&&&03747.&&&&&03,747 km2)
State map highlighting Teller County
Washington County 121 Akron 1887-02-09 Split from Weld County. Named in honor of George Washington, the first President of the United States. &&&&&&&&&&&04630.&&&&&04,630 &&&&&&&&&&&06534.2800006,534.28 sq mi
(&&&&&&&&&&016924.&&&&&016,924 km2)
State map highlighting Washington County
Weld County 123 Greeley 1861-11-01 Created as one of the 17 original counties of the Territory of Colorado. Named in honor of Lewis Ledyard Weld, the first Secretary of the Territory of Colorado. &&&&&&&&&0236857.&&&&&0236,857 &&&&&&&&&&010395.79000010,395.79 sq mi
(&&&&&&&&&&026925.&&&&&026,925 km2)
State map highlighting Weld County
Yuma County 125 Wray 1889-03-15 Split from Washington County. Named for the Yuma Native American tribe. &&&&&&&&&&&09829.&&&&&09,829 &&&&&&&&&&&06137.2600006,137.26 sq mi
(&&&&&&&&&&015895.&&&&&015,895 km2)
State map highlighting Yuma County

Historic countiesEdit

The sortable table below lists all the historic counties of the Territory of New Mexico, the Territory of Utah, the Territory of Kansas, and the extralegal Territory of Jefferson that previously existed within the boundaries of the present State of Colorado, as well as the three defunct counties of the Territory of Colorado and the three defunct counties of the State of Colorado. The table includes the following information:

  • The official name of the county,
  • The territory or state,
  • The date the county was created,
  • The date the county was abolished or excluded from the Territory of Colorado, and
  • Historical notes.
Counties formerly within the State of Colorado
County Territory or State Created Superseded History
Taos County Territory of New Mexico 185201091852-01-09 186102281861-02-28 One of the seven partidos of the province of Nuevo México. One of the nine original counties created by the Territory of New Mexico in 1852. Excluded from the Territory of Colorado in 1861.
Great Salt Lake County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Iron County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Sanpete County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Utah County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Washington County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Excluded from the Territory of Colorado in 1861.
Green River County Territory of Utah 185203031852-03-03 186102281861-02-28 Created by the Territory of Utah in 1852. Dissolved in 1857, but recreated in 1859. Excluded from the Territory of Colorado in 1861 and the Territory of Wyoming in 1868. Finally dissolved in 1872.
Arapahoe County Territory of Kansas 185508251855-08-25 186101291861-01-29 Created by the Territory of Kansas in 1855, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Beaver County Territory of Utah 185601051856-01-05 186102281861-02-28 Split from Iron and Millard counties in 1856. Excluded from the Territory of Colorado in 1861.
Broderick County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
El Paso County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Fremont County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Montana County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Oro County Territory of Kansas 185902071859-02-07 186101291861-01-29 Split from Arapahoe County in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Peketon County Territory of Kansas 185902071859-02-07 186101291861-01-29 Created by the Territory of Kansas in 1859, but never organized. Reverted to unorganized territory when Kansas joined the Union in 1861.
Arrappahoe County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Cheyenne County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
El Paso County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Fountain County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Heele County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Jackson County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Jefferson County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Montana County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
North County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Park County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Saratoga County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
St. Vrains County Territory of Jefferson 18591199November 1859 186102281861-02-28 One of the 12 counties created by the extralegal Territory of Jefferson in 1859.
Mora County Territory of New Mexico 186002011860-02-01 186102281861-02-28 Split from Taos County in 1860. Excluded from the Territory of Colorado in 1861.
Guadalupe County Territory of Colorado 186111011861-11-01 186111071861-11-07 One of the 17 original counties created by the Territory of Colorado in 1861. The county was renamed Conejos County after only six days.
Greenwood County Territory of Colorado 187002111870-02-11 187402061874-02-06 Created from former Cheyenne and Arapaho tribal land and the eastern portion of Huerfano County in 1870. The county was abolished in 1874 and its territory split between Elbert County and Bent County.
Platte County Territory of Colorado 187202091872-02-09 187402091874-02-09 Created from the eastern portion of Weld County in 1872. The county was abolished in 1874 after organizers failed to secure voter approval. The territory of the county was returned to Weld County.
Carbonate County State of Colorado 187902081879-02-08 187902101879-02-10 Lake County was renamed Carbonate County in 1879. Only two days later, Carbonate County was split into the new Chaffee County and the renamed Lake County.
Uncompaghre County State of Colorado 188302271883-02-27 188303021883-03-02 Ouray County was renamed Uncompaghre County for only four days in 1883.
South Arapahoe County State of Colorado 190211151902-11-15 190304111903-04-11 One of three counties created from Arapahoe County in 1902. The name was changed back to Arapahoe County after five months.

No organized counties of the District of Louisiana, the Territory of Missouri, or the Territory of Nebraska existed within the present boundaries of the State of Colorado.

Colorado county minutiaeEdit

County County Seat
Alamosa County City of Alamosa
Boulder County City of Boulder
BroomfieldCity and County of Broomfield City and County of Broomfield
Conejos County unincorporated town of Conejos
Delta County City of Delta
DenverCity and County of Denver City and County of Denver
Eagle County Town of Eagle
Gunnison County City of Gunnison
Montrose County City of Montrose
Ouray County City of Ouray
Pueblo County City of Pueblo
Saguache County Town of Saguache
  • Of all 64 Colorado counties, only Conejos County has a county seat that is not an incorporated municipality.
  • The name of each of the following two Colorado counties forms one part of the name of its county seat:
County County Seat
Cheyenne County Town of Cheyenne Wells
Morgan County City of Fort Morgan
  • Weld County has the most incorporated municipalities of any Colorado county with 31.
  • The following nine Colorado counties have no incorporated municipalities other than the county seat:
County County Seat
Archuleta County Town of Pagosa Springs
Bent County City of Las Animas
BroomfieldCity and County of Broomfield City and County of Broomfield
DenverCity and County of Denver City and County of Denver
Hinsdale County Town of Lake City
Jackson County Town of Walden
Lake County City of Leadville
Mineral County Town of Creede
San Juan County Town of Silverton

See alsoEdit

ReferencesEdit

  1. ^ a b "EPA County FIPS Code Listing". EPA. http://www.epa.gov/enviro/html/codes/co.html. Retrieved 2007-04-09. 
  2. ^ {{cite web | url = http://www.cdphe.state.co.us/hs/cntyseat.html | title = Colorado County Seats | format = [[2007-01-30|]]
  3. ^ Cite error: Invalid <ref> tag; no text was provided for refs named NACO
  4. ^ {{cite web | url = http://www.stanwyck.com/cogenweb/cocounties.html | title = Colorado County Evolution | format = [[HTML|]]
  5. ^ {{cite web | url = http://www.census.gov/popest/counties/files/CO-EST2006-ALLDATA.csv | title = Annual County Population Estimates and Estimated Components of Change: April 1, 2000 to July 1, 2006 (CO-EST2006-alldata) | format = [[2007-03-22|]]
  6. ^ {{cite web | url = http://www.dola.state.co.us/dlg/demog/population/landarea.pdf | title = Colorado Counties Land and Population Density | format = [[2006-10-31|]]


This page uses content from the English language Wikipedia. The original content was at List of counties in Colorado. The list of authors can be seen in the page history. As with this Familypedia wiki, the content of Wikipedia is available under the Creative Commons License.

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