District of Columbia counties

1 counties have formation records (oldest: District of Columbia, 1871). 1 counties have decade population series. 1 counties have nearby NPS units. 1 counties are near ABPP Civil War study areas. 1 counties have GNIS places (37 cemeteries statewide in this extract).

See each county page for charts, formation parents, NPS sites, cemeteries, battlefields, and HMdb links.