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Population of Counties in Maryland (2024)

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2024 Population
Growth Since 2020
Area (mi²)
Density (/mi²)
Montgomery County1,063,8810.28%1902,158Montgomery County location
Prince George's County947,880-1.81%1861,962Prince George's County location
Baltimore County843,420-1.17%2311,410Baltimore County location
Anne Arundel County595,8171.14%1601,436Anne Arundel County location
Baltimore city561,371-3.74%316,931Baltimore city location
Howard County336,6361.15%971,341Howard County location
Frederick County299,2429.7%255453Frederick County location
Harford County265,4731.62%169607Harford County location
Carroll County177,8062.81%173397Carroll County location
Charles County173,8354.25%177380Charles County location
Washington County156,3691.08%177341Washington County location
St. Mary's County115,7791.56%139323St. Mary's County location
Cecil County106,4742.58%134308Cecil County location
Wicomico County105,1141.5%144281Wicomico County location
Calvert County94,8972.13%82446Calvert County location
Allegany County67,280-1%163159Allegany County location
Worcester County54,4083.59%181116Worcester County location
Queen Anne's County53,2966.52%144143Queen Anne's County location
Talbot County37,8320.92%104141Talbot County location
Caroline County33,7591.47%123106Caroline County location
Dorchester County33,1751.98%20961Dorchester County location
Garrett County28,258-1.88%25144Garrett County location
Somerset County25,2122.65%12479Somerset County location
Kent County19,3111%10770Kent County location

There are 24 counties in Maryland. In 2019, the most populous county in Maryland is Montgomery County, adjacent to Washington, D.C. and one of America's most affluent counties, with a population of 1,058,810. This represents population growth of 8.47% since the 2010 census. Other populous counties in Maryland include Prince George's County (912,756), Baltimore County (832,468), Baltimore city (611,648), Anne Arundel County (573,235). These are the only Maryland counties with a population of more than 500,000. All five counties have experienced positive population growth since the last census except Baltimore city, which has a population that has declined by 1.51%.

Maryland Counties with Fewest Residents

The least populated county in Maryland is Kent County with 19,384 residents. Since the last census, Kent County's population has grown by -4.07%. Following Kent County, the least populated counties in Maryland include Somerset County (25,918), Garrett County (29,233), Dorchester County (32,162), Caroline County (33,193), and Talbot County (37,103). These are the only counties below 40,000 residents. All six counties have experienced negative population growth except Caroline County, which has grown very modestly by 0.41%.

Maryland Counties with Rapid Growth

Howard County has experienced the highest population growth in Maryland since the last census with a growth rate of 11.26% to a total 2019 population of 321,113. Other counties that have posted population growth of more than 5% since the 2010 census include Charles County (8.53%), Montgomery County (8.47%), Frederick County (7.62%), and St. Mary's County (6.53%). The county that has experienced the most significant decline is Allegany County with -4.48% growth since the census.

Lists of Counties in all States

  1. Maryland State Data Center
  2. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  3. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  4. American Community Survey (2009 - 2013)
  5. Census QuickFacts
  6. Historical Populations of States and Counties (1790 - 1990)