Baltimore Metro Area Counties

7 counties · 2.9 million people (2025) · 2,601 sq mi

The Baltimore metro area (officially the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area) has 7 counties in Maryland, with 2,857,781 people in 2025. Baltimore County is the most populous.

Map of the 7 counties of the Baltimore metro area with county names and major cities
The 7 counties of the Baltimore metro area (yellow) with the largest cities. Boundaries: U.S. Census Bureau, 2025. Free to use with attribution (CC BY 4.0).
PDF (Letter) 272 KBPNG (2400 px) 166 KB

The 7 counties of the Baltimore metro area

Sorted by population. 4 are central counties (the urban core); the others are outlying counties tied to it by commuting.

CountyCounty seatPopulation 2025Change since 2020Land area (sq mi)Type
Baltimore CountyTowson847,650−0.8%598Central
Anne Arundel CountyAnnapolis603,380+1.8%415Central
Baltimore cityBaltimore569,997−2.7%81Central
Howard CountyEllicott City339,183+2.1%251Central
Harford CountyBel Air266,446+2.1%437Outlying
Carroll CountyWestminster176,677+2.2%448Outlying
Queen Anne's CountyCentreville54,448+9.2%372Outlying

The metro area is part of the larger Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area.

Printable map

The PDF is a vector file for Letter paper; the PNG is 2400 pixels wide. Both are free to use with a credit to WhichCounty.

County maps of Maryland

Other metro areas

Sources