Founded in 1695, Dukes County is one of 14 counties in the state of Massachusetts. Historically, Dukes County was formed from Martha’s Vineyard and the Elizabeth Islands, which had been part of Dukes County, New York until Massachusetts gained it in 1691. The city of Edgartown is the county seat. With FIPS code of 7, Dukes County has a population of 21,097 and area of 104 square miles (269 km2).
List of all cities in Dukes County, MA alphabetically
| City/Town | Postal Code | Area Code |
| Aquinnah, MA | 02535 | 508/774 |
| Chappaquiddick Island, MA | 02539 | 508/774 |
| Chilmark, MA | 02535 | 508/774 |
| 02552 | 508/774 | |
| Cuttyhunk, MA | 02713 | 508/774 |
| Edgartown, MA | 02539 | 508/774 |
| Gay Head, MA | 02535 | 508/774 |
| Gosnold, MA | 02713 | 508/774 |
| Menemsha, MA | 02552 | 508/774 |
| North Tisbury, MA | 02568 | 508/774 |
| Oak Bluffs, MA | 02557 | 508/774 |
| Tisbury, MA | 02568 | 508/774 |
| 02573 | 508/774 | |
| 02575 | 508/774 | |
| Vineyard Haven, MA | 02568 | 508/774 |
| 02573 | 508/774 | |
| West Chop, MA | 02573 | 508/774 |
| West Tisbury, MA | 02568 | 508/774 |
| 02575 | 508/774 |