| ZIP Codes: | 7 ZIP Codes (3 Standard, 4 PO Box, 0 Unique) [See All] |
| Area Codes: | 508 / 774 |
| Timezone: | Eastern (GMT -05:00) |
| Local Time: | 2:12:27 PM |
| Population: | 20,925 [See All] |
| FIPS: | 25007 |
| CBSA: | Vineyard Haven, MA |
| Land Area: | 112 sq mi |
| Water Area: | 60 sq mi |
| Coordinates: | 41.3976, -70.6795 |
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20,925 residents live across 7 ZIPs covering 112 sq mi, served by 7 distinct USPS-recognized cities.
Population moved from 16,894 to 20,925 from 2014 to 2024 — a +23.9% change. 3 ZIPs gained residents, 3 lost.
The county's wealthiest ZIP 02575 (West Tisbury, $173,417 median) and poorest ZIP 02568 (Vineyard Haven, $115,417) are 2.5 miles apart — a 1.5× income gap across local geography.
Median home values vary 2.0× across this county — from $937,100 in 02568 (Vineyard Haven) to $1,888,000 in 02535 (Chilmark).
Density varies 6× across the county — from 82 people/sq mi in 02535 (Chilmark) to 518 in 02557 (Oak Bluffs).
Educational attainment ranges from 41.6% bachelor's+ in 02557 (Oak Bluffs) to 67.4% in 02535 (Chilmark) — the breadth of educational profiles across the area.
Within Massachusetts, this is the #13 most populous of 14 counties and ranks #4 for median household income with the #2 fastest decade growth .
On the national stage, Dukes County is ranks #55 for income .
Weighted by population, the typical household earns about $130,418 across the county — reflecting what a typical resident sees, not a simple ZIP average.
51.9% of adults age 25+ hold a bachelor's degree or higher (8,577 of 16,534 reporting).
3 Standard delivery, 4 PO Box only, 0 single-entity Unique ZIPs serve this county.
1 ZIP in this county where more than 60% of adults 25+ hold a bachelor's degree — typically college campuses, research enclaves, or tech corridors.
Dukes County grew 23.9% over the past decade — concentrated in 3 high-growth ZIPs:
| ZIP | City | Type | Population | Median Income | Area (sq mi) | 10-yr Growth |
|---|---|---|---|---|---|---|
| 02568 | Vineyard Haven | Standard | 9,412 | $115,417 | 32.7 | 133.2% |
| 02539 | Edgartown | Standard | 5,278 | $125,236 | 29.9 | 26.1% |
| 02575 | West Tisbury | PO Box | 2,718 | $173,417 | 6.1 | -0.3% |
| 02535 | Chilmark | Standard | 2,244 | $153,966 | 27.5 | 77.0% |
| 02557 | Oak Bluffs | PO Box | 1,250 | — | 2.4 | -72.8% |
| 02713 | Cuttyhunk | PO Box | 23 | $79,167 | 13.1 | -70.5% |
| 02552 | Menemsha | PO Box | — | — | 0.0 | — |