It has been proposed that county categories should not be in categories for year of establishment but that their main ("topic") articles should. I disagree. I think the category should be, and the article may be. More generally, I feel sure that a category should be in every other category that its topic article is in.
See detailed commentary with much reference to Wikipedia at http://genealogy.wikia.com/wiki/Genealogy_talk:Categories#Topic_articles.
Robin Patterson 03:18, 9 October 2008 (UTC)