Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2020 census, the population was 422,937, almost one-third the population of the entire state. Its county seats are Manchester and Nashua, the state's two... Wikipedia
Cities: Hillsborough, Deering, Antrim, and more
Population: 426,594 (2022)
County seat: Manchester
Area: 893 mi²
Congressional districts: 1st, 2nd
Largest city: Manchester (by population); Weare (by area)