PlainCities

Counties · Maryland

Counties of Maryland

Maryland has 24 counties. Montgomery County is the largest with 1,074,582 residents in 2025. 20 of the 24 gained residents between 2020 and 2025 by the Census Bureau's estimates.

What counties are in Maryland?

Sorted by the 2025 population estimate; sort by any column.

Counties of Maryland: 2025 estimate, change since 2020, ACS 2020-2024 5-year estimates
Montgomery County1,074,582+1.2%59232$132,450$640,300
Prince George's County970,374+0.3%85214$101,798$426,000
Baltimore County847,650−0.8%32219$91,768$349,300
Anne Arundel County603,380+1.8%32130$124,911$467,900
Baltimore city569,997−2.7%1199$62,177$229,600
Howard County339,183+2.1%1159$149,763$597,900
Frederick County302,883+11.5%2865$122,002$464,600
Harford County266,446+2.1%1659$112,265$386,400
Carroll County176,677+2.2%937$118,211$434,000
Charles County176,593+6.0%1335$122,816$428,500
Washington County157,731+2.0%6136$77,747$296,100
St. Mary's County116,692+2.6%1123$119,446$407,600
Cecil County107,131+3.3%821$92,007$343,400
Wicomico County106,899+3.2%1921$76,210$254,700
Calvert County94,484+1.8%1419$133,922$460,200
Allegany County66,848−1.9%4422$59,603$154,900
Worcester County54,459+3.8%1118$81,745$374,700
Queen Anne's County54,448+9.2%1514$112,826$462,700
Talbot County38,238+1.9%711$84,811$409,700
Caroline County34,116+2.5%139$68,457$290,100
Dorchester County33,628+3.4%1410$61,839$262,400
Garrett County28,370−1.5%159$67,688$235,300
Somerset County24,973+1.5%117$64,943$173,200
Kent County19,565+1.9%146$80,147$330,900

Source: PEP Vintage 2025 (CO-EST2025); American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Census population estimates

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections