Calvert County area

Population and density of Calvert County

The Census Bureau estimates that 94,484 people lived in Calvert County on July 1, 2025. That ranks #656 of 3,222 county equivalents nationally and #15 of 24 in Maryland. Since the April 1, 2020 estimates base of 92,791, the population has grown by 1,693 (+1.8%), compared with +1.4% for Maryland as a whole.

With 213.2 square miles of land, that is 443 people per square mile (171 per km²), placing Calvert County #380 nationally for density and #9 in Maryland. The median county equivalent has 47 people per square mile; the Maryland median is 335. Put another way, there are about 1.4 acres of land per resident.

U.S. Census Bureau, Vintage 2025 population estimates. Estimates are revised each year and are not decennial census counts. Density divides the whole population by the whole county’s land area, so it describes an average, not how settlement is distributed within the county. Population sources and methods.

Cities and towns in Calvert County

2 incorporated places lie at least partly in Calvert County. Together they are home to 8,645 people (9.1%); the other 85,839 (90.9%) live outside any incorporated place, in unincorporated communities and rural areas.

The largest is Chesapeake Beach town, with 6,466 residents in the county. Among places with at least 1,000 residents in 2020, Chesapeake Beach town grew fastest since then (+1.8%).

Population: U.S. Census Bureau Vintage 2025 subcounty estimates, counting only the part of each place inside Calvert County. Land: 2026 Census Gazetteer, for the whole place even where it extends into other counties. How communities are listed.

Metropolitan area

Calvert County is a central county of the Lexington Park, MD Metropolitan Statistical Area. Its 2 county equivalents have 211,176 residents on 571.8 square miles of land; Calvert County accounts for 37.3% of the land and 44.7% of the residents. By combined land it ranks #345 of 393 metropolitan areas, and #227 by population. It belongs to the Washington-Baltimore-Arlington, DC-MD-VA-WV-PA Combined Statistical Area.

ZIP codes

14 ZIP Code Tabulation Areas have land in Calvert County; 12 of them have most of their land inside the county, and the others mainly cover neighboring areas.

2061520629206392065720676206782068520688206892071420732207362075420758

ZIP Code Tabulation Areas are the Census Bureau’s approximations of USPS ZIP Code service areas, from the 2020 Census relationship files. Lighter codes have less than half of their land in this county. Post-office-box and single-address ZIP Codes have no tabulation area.

Counties bordering Calvert County

Calvert County shares a land border with 4 county equivalents. Each of them has more land than Calvert County. The largest neighbor is Prince George's County (482.6 mi²) and the smallest is St. Mary's County (358.6 mi²). Together with its neighbors, Calvert County forms a block of 1,927 mi² of land, of which it holds 11.1%.

How big is Calvert County compared with U.S. states?

Calvert County has less land than any of the 50 states. Rhode Island, the smallest state by land area, has 1,033.9 mi², about 4.8 times as much. Maryland’s county land could hold about 46 areas the size of Calvert County.

Another way to picture it: the same land area would fill a square about 14.6 miles (23.5 km) on each side. Real county shapes are rarely square, so this is a scale reference rather than a width or driving distance.

State figures are the sums of each state’s county-equivalent land measurements in the same Census release, so states and counties are compared on the same basis. Published state totals can differ slightly because of rounding. Compare all states · Counties bigger than entire states.

What stands out about Calvert County?

Calvert County has more land than 243 of the other 3,221 county equivalents in the dataset.

A median is the middle county-equivalent measurement, not the average of the largest and smallest. All three bars use the same linear scale. Very small areas may appear as a thin sliver; the labels retain their values.

Does including water change its rank?

Using land plus water places Calvert County at #2,745 nationally by total area, 234 places closer to the top than its land rank. The water assigned to this geography moves it ahead of some county equivalents with more land.

Its water share is 38.2%, compared with a national county-equivalent median of 1.2% — 37.1 percentage points higher. This describes the statistical geography’s land/water mix, not flood exposure or developable land.

Closest positions in the national land ranking

These entries sit immediately beside Calvert County in the national ranking. They can be in different states and are not necessarily geographic neighbors.

Calculated from the same Census release as the area table. Total-area order uses original ALAND + AWATER; water shares and chart labels use published square miles. Calculation details.