Historical clue formulations

• Seat of Pennsylvania's Adams County — 2022-03-09
• Where 3-Down's address was delivered — 2013-11-19
• Locale for an 1863 address — 2013-10-07
• See 62-Down — 2010-02-11
• Place with a famous address — 2000-09-06
• Meade vs. Lee, July 1863 — 1997-06-16