Capitol South is located on the Blue Line (Blue Line), one of Washington DC's operational metro corridors. It sits between Federal Center SW and Eastern Market, making it a convenient stop for the surrounding area.

What makes Capitol South particularly useful is its interchange connection with Orange Line, Silver Line. If you need to switch between lines, this is where you'll do it – and you won't need to exit or purchase a new ticket. The interchange corridor is clearly signposted with color-coded directions.