A
- Abbeville County, South Carolina
- Aberdeenshire (historic)
- Acadia Parish, Louisiana
- Accomack County, Virginia
- Ada County, Idaho
- Adair County, Oklahoma
- Adams County, Mississippi
- Adams County, Nebraska
- Adams County, Ohio
- Adilabad district
- Agra district
- Ahmedabad district
- Ahmednagar district
- Ajmer district
- Akola district
- Alappuzha district
- Alcorn County, Mississippi
- Aleutians East Borough, Alaska
- Allahabad district
- Alleghany County, Virginia
- Allen County, Kansas
- Almora district
- Alpena County, Michigan
- Alwar district
- Ambedkar Nagar district
- Amravati district
- Amreli district
- Amritsar district
- Anand district
- Anantapur district
- Anantnag district
- Anderson County, Kansas
- Angul district
- Angus
- Anjaw district
- Anoka County, Minnesota
- Anuppur district
- Apache County, Arizona
- Araria district
- Arkansas County, Arkansas
- Arwal district
- Ascension Parish, Louisiana
- Ashley County, Arkansas
- Ashoknagar district
- Asotin County, Washington
- Assumption Parish, Louisiana
- Atchison County, Kansas
- Athens County, Ohio
- Atlantic County, New Jersey
- Augusta County, Virginia
- Auraiya district
- Autauga County, Alabama
- Avoyelles Parish, Louisiana
- Ayrshire
B
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B cont.
- Banffshire
- Bangalore Rural district
- Bangalore Urban district
- Banka district
- Bankura district
- Banswara district
- Barabanki district
- Baraga County, Michigan
- Baramulla district
- Baran district
- Barber County, Kansas
- Barbour County, Alabama
- Bardhaman district
- Bareilly district
- Bargarh district
- Barmer district
- Barpeta district
- Barren County, Kentucky
- Barron County, Wisconsin
- Barrow County, Georgia
- Barton County, Kansas
- Bartow County, Georgia
- Barwani District
- Bastar district
- Basti district
- Bathinda district
- Baxter County, Arkansas
- Bay County, Florida
- Bayfield County, Wisconsin
- Baylor County, Texas
- Beauregard Parish, Louisiana
- Beaver County, Utah
- Beaverhead County, Montana
- Becker County, Minnesota
- Bedfordshire
- Bee County, Texas
- Beed district
- Begusarai district
- Belgaum district
- Bell County, Texas
- Bellary district
- Bennington County, Vermont
- Benton County, Arkansas
- Benton County, Indiana
- Benton County, Iowa
- Benton County, Minnesota
- Benton County, Mississippi
- Benton County, Missouri
- Benton County, Oregon
- Benton County, Washington
- Bergen County, New Jersey
- Berks County, Pennsylvania
- Berkshire
- Berkshire County, Massachusetts
- Bertie County, North Carolina
- Berwickshire
- Betul District
- Bexar County, Texas
- Bhadrak district
- Bhagalpur district
- Bhandara district
- Bharatpur district
- Bharuch district
- Bhavnagar district
- Bhilwara district
- Bhind District
- Bhiwani district
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B cont.
- Bibb County, Alabama
- Bienville Parish, Louisiana
- Bijapur district, Karnataka
- Bijnor district
- Bikaner district
- Birbhum district
- Bishnupur district
- Blaine County, Montana
- Blaine County, Nebraska
- Blaine County, Oklahoma
- Blount County, Alabama
- Blount County, Tennessee
- Blue Earth County, Minnesota
- Bolivar County, Mississippi
- Bollinger County, Missouri
- Bonner County, Idaho
- Bonneville County, Idaho
- Boone County, Arkansas
- Boone County, Iowa
- Borden County, Texas
- Bosque County, Texas
- Template:Bot county article header
- Bottineau County, North Dakota
- Boudh district
- Bourbon County, Kansas
- Bourbon County, Kentucky
- Box Butte County, Nebraska
- Box Elder County, Utah
- Boyle County, Kentucky
- Bradford County, Florida
- Bradford County, Pennsylvania
- Bradley County, Arkansas
- Bradley County, Tennessee
- Branch County, Michigan
- Brantley County, Georgia
- Brazos County, Texas
- Brevard County, Florida
- Briscoe County, Texas
- Bristol Bay Borough, Alaska
- Bristol County, Massachusetts
- Bristol County, Rhode Island
- Broadwater County, Montana
- Broome County, New York
- Broward County, Florida
- Brown County, Illinois
- Brown County, Indiana
- Brown County, Kansas
- Brown County, Minnesota
- Brown County, Nebraska
- Brown County, Ohio
- Brown County, South Dakota
- Brown County, Texas
- Brown County, Wisconsin
- Brule County, South Dakota
- Buchanan County, Virginia
- Buckingham County, Virginia
- Buckinghamshire
- Bucks County, Pennsylvania
- Buena Vista County, Iowa
- Buffalo County, Nebraska
- Buffalo County, South Dakota
- Buffalo County, Wisconsin
- Bulandshahr district
- Buldhana district
- Bullitt County, Kentucky
- Bulloch County, Georgia
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