What are the largest counties in Maryland?

Montgomery County is the largest county in Maryland, with 1,074,582 residents in 2025 (Census PEP). Prince George's County (970,374) and Baltimore County (847,650) come next.

Data as of 2025 · updated November 5, 2026

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All 24 ranked Maryland counties

Maryland counties ranked by population
Rank	County	Residents 2025	Change 2020–25
1	Montgomery County	1,074,582	+1.3%
2	Prince George's County	970,374	+0.5%
3	Baltimore County	847,650	−0.7%
4	Anne Arundel County	603,380	+1.7%
5	Baltimore (city)	569,997	−2.3%
6	Howard County	339,183	+1.9%
7	Frederick County	302,883	+11.0%
8	Harford County	266,446	+2.0%
9	Carroll County	176,677	+2.2%
10	Charles County	176,593	+5.9%
11	Washington County	157,731	+2.0%
12	St. Mary's County	116,692	+2.4%
13	Cecil County	107,131	+3.2%
14	Wicomico County	106,899	+3.2%
15	Calvert County	94,484	+1.7%
16	Allegany County	66,848	−1.6%
17	Worcester County	54,459	+3.7%
18	Queen Anne's County	54,448	+8.8%
19	Talbot County	38,238	+2.0%
20	Caroline County	34,116	+2.5%
21	Dorchester County	33,628	+3.4%
22	Garrett County	28,370	−1.5%
23	Somerset County	24,973	+1.7%
24	Kent County	19,565	+2.3%

How this is ranked

The Census Bureau's July 1 resident population estimates for 2025, largest first, with the change since 2020. Counties with fewer than 1,000 residents are not ranked. Areas without an estimate for the same year as the others are not ranked.

Source: U.S. Census Bureau, Population Estimates Program (Vintage 2025). Figures come from public federal statistics and are informational only, not investment advice. Check the source before relying on a number. Methodology: how ranks and figures are built.

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Questions

What is the largest county in Maryland?

Montgomery County is the largest county in Maryland, with 1,074,582 residents in 2025 (Census PEP). Prince George's County (970,374) and Baltimore County (847,650) come next.

How is this ranking calculated?

More rankings for Maryland

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