Deal Island is a community in Somerset County, Maryland, home to about 341 people across 3.0 square miles. Its ZIP code is 21821.
Homes sold for a median of $152 per square foot in the three months ending August 2026, a balanced market.
Mostly Deal Island; also Chance and Dames Quarter
Each card is that ZIP code’s whole market, including any part outside Deal Island. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
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| Nearest major airport | Ronald Reagan Washington National Airport (DCA)76 miles away |
|---|---|
| Closer regional airport | Salisbury Ocean City Wicomico Regional Airport (SBY)27 miles away |
| Nearest city of 250,000+ | Washington, DC78 miles away |
| Nearest city of 1 million+ | Philadelphia, PA135 miles away |
Straight-line distances from the center of Deal 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.
Deal Island had 375 residents in the 2020 census, down 35% since 2000.
It’s the 413th largest of 527 towns in Maryland by population.
Somerset County grew from 25,923 residents in 1900 to 24,620 in 2020.
Somerset County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 89°F in summer, and winter lows average 29°F. About 48 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Salisbury, MD weather station (24 miles away).
4,141 jobs at 360 businesses in Somerset 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 Deal Island.
Nearest hospitals
Providers with an office here
| Nurse practitioners and physician assistants | 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.
Public schools here are run by Somerset County Public Schools. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Deal Island SchoolDeal Island | Pre-K–5 | 117 | Public | 0.3 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Chance and Dames Quarter.
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.