Nantucket is a town, a county and an island—all one and the same (map).

Nantucket Town is the historic, commercial, business and shopping center, with most of the island's shops, boutiques, hotels and inns, restaurants and services including police, firefighters and hospital.

The only other settlement of any size is little Siasconset, a village to the southeast of the main town, referred to by islanders as 'Sconset.