www.wmata.com has a map of DC with all of the metro stations. Those are named after the neighborhoods that they are in.
Washington, DC is one complete city. Like all cities it has sections and neighborhoods, many of which have names, but it is a single city.
there are no counties in Washington DC because Washington DC is a city itself.
The capital building in Washington DC was designed by Dr William Thornton. The plan had three sections to house the House of Representatives, Congress as well as the main building.
air miles from Chicago Washington DC
There are many local carnivals in Washington DC through out the year although it is generally frowned upon for someone who doesn't live in DC to attend.
3500
7
air miles from Chicago Washington dc
Washington, DC
Washington DC
1 hour
Yes, in fact there are many different rail lines. Amtrak trains pass through Washington DC and Virginia. The Washington DC Metro system has many stations in both Virginia and Washington DC. CSX and other cargo trains pass through DC and Virginia.