They share a common border.
About 150 Miles
It is about 40 miles from DC to Damascus so it takes about an hour.
Baltimore, Maryland is 25 miles north east of Washington, DC. Some other cities close to Washington, DC are Bethesda, Maryland, and Annapolis, Maryland.
It is 76 miles according to Google Maps.
Maryland borders Washington DC, so this question depends on where you are in Maryland. It could be several miles or no distance at all.
86 miles about 1 hour and 45 minutes. by car
Annapolis, Maryland is only 32.6 miles from Washington, DC.
It is 160.44 miles according to MapQuest.
It is 67.37 miles according to MapQuest.
It is 21.28 miles according to MapQuest.
It is 47.76 miles according to MapQuest.
It is 118.88 miles according to MapQuest.