District of Columbia:

Washington, D.C. Official Website - The capital of the United States, Washington, D.C., is known for its iconic landmarks, government institutions, and cultural attractions. It's a hub of political, historical, and cultural significance.

 

Maryland:

Bethesda - Located in Montgomery County, Bethesda is a vibrant urban area known for its shopping districts, dining options, and cultural amenities.
Silver Spring - A diverse community in Montgomery County, Silver Spring is recognized for its entertainment venues, parks, and diverse culinary scene.
Rockville - As the county seat of Montgomery County, Rockville offers a mix of residential neighborhoods, commercial centers, and cultural attractions.
Gaithersburg - Known for its economic diversity, Gaithersburg is a city in Montgomery County with a thriving business community and various recreational options.
College Park - Home to the University of Maryland, College Park is a college town with a lively atmosphere and a mix of student life and local businesses.
Bowie - Located in Prince George's County, Bowie is a suburban city known for its parks, family-friendly neighborhoods, and recreational facilities.
Annapolis - The capital of Maryland, Annapolis is known for its historic charm, waterfront attractions, and as a center for maritime activities.
Laurel - Situated between Washington, D.C., and Baltimore, Laurel is a city in Prince George's County with a mix of residential and commercial areas.
Greenbelt - A planned community in Prince George's County, Greenbelt is known for its green spaces, community events, and cooperative housing.

 

Virginia:

Arlington - Adjacent to Washington, D.C., Arlington is known for its urban neighborhoods, the Pentagon, Arlington National Cemetery, and a mix of cultural attractions.
Alexandria - Located along the Potomac River, Alexandria is known for its historic Old Town, waterfront, and a blend of historic and modern architecture.
Fairfax - A city in Fairfax County, Fairfax boasts a historic downtown area, cultural institutions, and proximity to George Mason University.
Falls Church - Known for its charming downtown area, Falls Church is an independent city with a rich history and diverse community.
Reston - A planned community in Fairfax County, Reston is known for its extensive parks, lakes, and a town center with shopping and dining options.
Herndon - Located in Fairfax County, Herndon is a suburban town with a mix of residential neighborhoods, parks, and cultural amenities.
Tysons - Tysons Corner is a major business and commercial hub in Fairfax County, featuring shopping malls, office complexes, and entertainment options.
McLean - An affluent community in Fairfax County, McLean is known for its upscale residential neighborhoods, proximity to nature, and the CIA headquarters.
Springfield - Situated in Fairfax County, Springfield offers a mix of residential and commercial areas, with Springfield Town Center as a prominent shopping destination.
Vienna - A small town in Fairfax County, Vienna is characterized by its historic charm, community events, and proximity to the Vienna Metro station.

List of Counties in The Washington metropolitan area.

 

District of Columbia:

Washington, D.C. (Note: The District of Columbia is not divided into counties but is an independent jurisdiction.)

 

Maryland: 

Montgomery County - Located to the northwest of Washington, D.C., Montgomery County is the state's most populous county. It offers a mix of urban and suburban areas, parks, and cultural attractions.
Prince George's County - Situated to the east of Washington, D.C., Prince George's County is known for its diverse communities, historical sites, and green spaces.
Frederick County - To the northwest of Washington, D.C., Frederick County combines historic charm with a growing economy. It features a mix of rural landscapes and urban centers.
Howard County - Positioned between Baltimore and Washington, D.C., Howard County is characterized by its affluent communities, excellent schools, and a blend of urban and rural elements.
Anne Arundel County - Located to the south of Baltimore, Anne Arundel County boasts waterfront areas, historical sites, and proximity to the Chesapeake Bay.
Charles County - Situated to the south of Washington, D.C., Charles County is known for its rural landscapes, historic sites, and the Potomac River waterfront.
Calvert County - To the southeast of Washington, D.C., Calvert County offers a mix of rural and suburban areas, waterfront communities, and access to the Chesapeake Bay.

 

Virginia: 

Fairfax County - Fairfax County, to the west of Washington, D.C., is the most populous county in Virginia. It features diverse communities, economic centers, and extensive parklands.
Arlington County - Adjacent to Washington, D.C., Arlington County is known for its urban neighborhoods, government buildings, and Arlington National Cemetery.
Prince William County - To the southwest of Washington, D.C., Prince William County offers a mix of suburban and rural areas, historical sites, and economic development.
Loudoun County - Located to the northwest of Washington, D.C., Loudoun County is known for its rapid growth, wineries, and a mix of suburban and rural landscapes.
City of Alexandria - Positioned along the Potomac River, Alexandria combines historical charm with modern amenities, featuring Old Town, waterfront attractions, and cultural sites.
City of Falls Church - An independent city, Falls Church is known for its small-town feel, historic downtown, and proximity to Washington, D.C.
City of Fairfax - Another independent city, Fairfax features a mix of residential areas, a historic downtown, and cultural institutions.
City of Manassas - As an independent city, Manassas is known for its historic sites, events, and a mix of residential and commercial areas.
City of Manassas Park - This independent city is situated to the northeast of Manassas and offers a mix of residential and commercial development.