Callaway is a community in St. Mary's County, Maryland, home to about 930 people across 4.8 square miles. Its ZIP code is 20620.
Homes sold for a median of $158 per square foot in the three months ending August 2026, a buyer’s market.
Each card is that ZIP code’s whole market, including any part outside Callaway. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Callaway’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)51 miles away |
|---|---|
| Nearest city of 250,000+ | Washington, DC54 miles away |
| Nearest city of 1 million+ | Philadelphia, PA144 miles away |
Straight-line distances from the center of Callaway; 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.
It’s the 342nd largest of 527 towns in Maryland by population.
St. Mary's County grew from 17,182 residents in 1900 to 113,777 in 2020.
St. Mary's County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 87°F in summer, and winter lows average 30°F. About 45.4 inches of rain and melted snow fall in a typical year, with about 13 inches of snow.
Source: NOAA 1991–2020 climate normals, Patuxent River Nas, MD weather station (8 miles away).
32,683 jobs at 2,090 businesses in St. Mary's County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
Nearest hospitals
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances.
Parks (1 nearby)
Grocery stores (1 nearby)
Pharmacies
Libraries
Museums
Counts are within about 1.5 miles 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.
| School | Grades | Students | Affiliation | Distance |
|---|---|---|---|---|
| The Kings Christian AcademyCallaway | Pre-K–12 | 332 | Christian (no specific denomination) | 1.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data for public schools; Private School Universe Survey (2023-2024) for private schools. Listed by address; we don’t rate schools.
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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.