Coös County is the least populated of all New Hampshire counties, and the only one with significant amounts of unincorporated land; over half of the municipal-like entities are unincorporated townships, gores, or grants, a rarity in New Hampshire, where nearly all of the land is incorporated as towns or cities. The population of these unincorporated territories is minuscule; collectively they account for less than 1% of the population of the county, with only three (Wentworth's Location, Millsfield, and Dixville) reporting populations in the double digits for recent censuses. Approximately 1/3 of the population lives in Berlin, the only city, most populous municipality, and economic hub. Lancaster serves as the county seat.