County Maps US

Carroll County, Maryland

A county in Maryland, ranked 9 of 24 by population.

CountyFIPS 24013

Within Maryland
Carroll County, highlighted, with the areas around it. Boundaries generalised from the 2025 Census cartographic boundary file; neighbour fills carry no data. The dot marks Westminster, the county seat, located via the 2025 Census Gazetteer.

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Population
176,677
+3,754 (+2.2%) since 2020
Land area
447.6
square miles. A further 1.1% of the total area is water
Population density
395
people per square mile, computed rather than published
County seat
Westminster
Seat of county government.
Established
1837
188 years ago
Largest city
Westminster city
Population 20,589.

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; Wikidata (CC0), Wikidata. Retrieved 30 August 2026.

Satellite view

Aerial imagery of Carroll County with its boundary drawn on top. A map shows you the shape; this shows you what is inside it, and which side of the line a place falls on.

Aerial view of Carroll County, Maryland from the USGS National Map, with its boundary outlined
Imagery: USGS National Map, USGS Imagery Only, public domain, requested from USGS by your browser when you reach this point on the page, at 800 by 743 pixels. The boundary is the 2025 Census cartographic boundary file, reprojected to Web Mercator to match the imagery. You can also open the USGS National Map viewer.

Where Carroll County ranks

Position among the 24 counties of Maryland, and among all 3,144 US counties and county-equivalents. Computed from the figures on this page.

MeasureValueIn MarylandNationally
Population176,6779th of 24396th of 3,144
Land area447.6 sq mi10th of 242,279th of 3,144
Population density395 per sq mi10th of 24349th of 3,144
Median household income$118,2118th of 2461st of 3,143

Full data for Carroll County

Every figure below is attributed to the Census Bureau product it came from, with the vintage of that product.
MeasureValueSource and vintage
Population176,677Vintage 2025 Population Estimates
Population in 2020172,923Vintage 2025 Population Estimates
2020 estimates base?172,886Vintage 2025 Population Estimates
Land area447.6 sq mi2025 Gazetteer Files
Water area5.1 sq mi2025 Gazetteer Files
Total area452.7 sq mi2025 Gazetteer Files
Population density?395 per sq miComputed: Vintage 2025 estimates divided by 2025 Gazetteer land area
Median household income$118,211American Community Survey 2020-2024 5-Year Estimates
Median home value$434,000American Community Survey 2020-2024 5-Year Estimates
Median age41.3American Community Survey 2020-2024 5-Year Estimates
Households64,285American Community Survey 2020-2024 5-Year Estimates
Housing units66,768American Community Survey 2020-2024 5-Year Estimates

Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025; US Census Bureau, American Community Survey, American Community Survey 2020-2024 5-Year Estimates, released 29 January 2026. Population density is computed here, not published: it divides the Vintage 2025 population estimate by the 2025 Gazetteer land area, which are two different Census products. Retrieved 30 August 2026.

How the population changed

The Census Bureau publishes the components behind an estimate, not just the total. For the year to July 2025:

Births minus deaths
-128
1,628 births, 1,756 deaths
Net migration
+15
More people moved in than moved out.

Source: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026. Retrieved 30 August 2026.

The 5 areas bordering Carroll County

Ordered by the length of the border actually shared, which the Census Bureau publishes in its county adjacency file and which no other county reference presents.

Bordering areaStateShared borderPopulation
Frederick CountyMaryland47 mi302,883
Baltimore CountyMaryland37 mi847,650
Howard CountyMaryland20 mi339,183
Adams CountyPennsylvania12 mi107,594
York CountyPennsylvania11 mi473,197

Source: US Census Bureau, County Adjacency File, 2025 County Adjacency File, released 15 September 2025. Retrieved 30 August 2026.

All 24 counties of Maryland

Open the interactive Maryland county map, or jump straight to any of them.

Data on this page last rebuilt 30 August 2026. How these figures are produced.