Dukes County, Massachusetts
County seat: Edgartown · Population 21,219 (2025) · 103 sq mi
Dukes County is the 13th most populous of Massachusetts's 14 counties, with 21,219 people (2025 estimate). Its county seat is Edgartown. The map shows its 0 cities and towns and the 3 neighboring counties.
Dukes County facts
- County seat
- Edgartown
- Population (2025 estimate)
- 21,219 +3% since 2020
- Land area
- 103 sq mi 12th largest of 14
- Water area
- 388 sq mi
- Population density
- 206 per sq mi
- Established
- 1695
- Named after
- Duke of York noble title in the United Kingdom
- Largest city
- Edgartown 5,446
- Median household income
- $125,786
- Cities and towns
- 0 plus 3 CDPs
- ZIP codes
- 7
- Time zone
- Eastern
- FIPS code
- 25007
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Vineyard Haven | 2,469 | |
| Oak Bluffs | 1,184 | |
| Edgartown | 904 |
ZIP codes in Dukes County
7 ZIP codes reach into Dukes County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 02535
- 02539
- 02543 also Barnstable County
- 02557
- 02568
- 02575
- 02713
Population of Dukes County, 2020–2025
Dukes County grew by 626 people (+3%) between April 2020 and July 2025: 15 more deaths than births and a net gain of 658 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 20,580 |
| 2021 | 21,110 |
| 2022 | 21,081 |
| 2023 | 21,063 |
| 2024 | 21,354 |
| 2025 | 21,219 |
Neighboring counties
- Bristol County northwest · 593,640 people
- Nantucket County east · 14,758 people
- Barnstable County northeast · 233,539 people
Printable Dukes County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (61 KB)
- PNG (2400 px) (67 KB)
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Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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