Cobb Island is a community in Charles County, Maryland, home to about 916 people across 0.6 square miles. Its ZIP codes are 20625 and 20661, and parts of 20664 are in Cobb Island too.
Homes sold for a median of $306 per square foot in the three months ending August 2026, a seller’s market.
All in Cobb Island
All in Cobb Island
Part is in Cobb Island, part in Rock Point
Each card is that ZIP code’s whole market, including any part outside Cobb Island. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Cobb Island’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Ronald Reagan Washington National Airport (DCA)41 miles away |
|---|---|
| Nearest city of 250,000+ | Washington, DC44 miles away |
| Nearest city of 1 million+ | Philadelphia, PA151 miles away |
Straight-line distances from the center of Cobb Island; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Cobb Island had 929 residents in the 2020 census, down 20% since 2010.
It’s the 343rd largest of 527 towns in Maryland by population.
Charles County grew from 17,662 residents in 1900 to 166,617 in 2020.
Charles County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 85°F in summer, and winter lows average 25°F. About 48.1 inches of rain and melted snow fall in a typical year, with about 15 inches of snow.
Source: NOAA 1991–2020 climate normals, Mechanicsville 5 Ne, MD weather station (17 miles away).
33,675 jobs at 2,793 businesses in Charles County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
1 doctors and other health care providers list an office in Cobb Island’s ZIP codes.
Nearest hospitals
Providers with an office here
| Mental health providers | 1 |
|---|
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (1 nearby)
Counts are within about 1 mile of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
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Shares ZIP codes with Rock Point.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.