Nantucket County, Massachusetts
County seat: Nantucket · Population 14,758 (2025) · 46 sq mi
Nantucket County is the 14th most populous of Massachusetts's 14 counties, with 14,758 people (2025 estimate). Its county seat is Nantucket. The map shows its 0 cities and towns and the 1 neighboring counties.
Nantucket County facts
- County seat
- Nantucket
- Population (2025 estimate)
- 14,758 +3.6% since 2020
- Land area
- 46 sq mi 14th largest of 14
- Water area
- 258 sq mi
- Population density
- 320 per sq mi
- Established
- 1695
- Named after
- Nantucket island of Massachusetts, United States
- Largest city
- Nantucket 14,758
- Median household income
- $139,688
- Cities and towns
- 0 plus 3 CDPs
- ZIP codes
- 3
- Time zone
- Eastern
- FIPS code
- 25019
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| Nantucket | 10,017 | |
| Madaket | 377 | |
| Siasconset | 204 |
ZIP codes in Nantucket County
3 ZIP codes reach into Nantucket County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 02554
- 02564
- 02584
Population of Nantucket County, 2020–2025
Nantucket County grew by 507 people (+3.6%) between April 2020 and July 2025: 365 more births than deaths and a net gain of 138 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 14,240 |
| 2021 | 14,518 |
| 2022 | 14,502 |
| 2023 | 14,562 |
| 2024 | 14,713 |
| 2025 | 14,758 |
Neighboring counties
- Dukes County west · 21,219 people
Printable Nantucket 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) (50 KB)
- PNG (2400 px) (54 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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