District of Columbia vs Maryland

The two states, county by county

Both maps share one density scale, so the same shade means the same number of people per square mile on either side of the border. Darker counties are denser. Select a county to open its page.

Side by side

Population and density

Maryland has 6,263,220 residents, 8.9 times District of Columbia's 702,250. District of Columbia ranks 49th and Maryland 18th of the 50 states and DC. District of Columbia is the more crowded, with 11,487.8 people per square mile against 645.0, 17.8 times.

Land area

Maryland has 9,711 square miles of land, 158.9 times District of Columbia's 61. The largest county-equivalent in District of Columbia is District of Columbia at 61 square miles; in Maryland it is Frederick County at 661.

Counties

Maryland is divided into 24 county-equivalents and District of Columbia into 1, so an average Maryland county covers 405 square miles against 61. The typical county in District of Columbia has 702,250 residents, against 111,399 in Maryland. The most populous are District of Columbia (702,250) and Montgomery County (1,082,273).

No county name appears in both states, so a county name alone is enough to tell which state a row belongs to.

Household income

The median county in District of Columbia has a household income of $104,643, 20% above Maryland's $87,200. The highest county incomes are District of Columbia ($104,643) in District of Columbia and Howard County ($140,113) in Maryland, from SAIPE 2023.

Capitals and daylight

Washington and Annapolis are 30 miles apart in a straight line; from Washington the initial bearing is 80°, E. On June 21, 2026, Washington gets 14 h 54 min of daylight and Annapolis 14 h 54 min; on December 21 the figures are 9 h 26 min and 9 h 26 min. Month by month tables are on the Washington and Annapolis daylight pages.

Where they sit

Both are in the Census South Atlantic division of the South region. By county internal points, District of Columbia spans 1 UTM zone and Maryland 2.