Historical clue formulations

• County div. — 2015-04-05
• County subdivision: Abbr. — 2012-04-29
• Municipal div. — 2012-01-07
• Local govt. unit — 2010-11-03
• Local govt. unit — 2009-04-24
• Local govt. unit — 2005-09-10
• Local political div. — 2001-01-04