Hillsborough County, New Hampshire

Hillsborough County is a county in New Hampshire with an estimated population of 427,354 in 2023. 2 cities, towns and Census places in it are indexed here.

Largest places in Hillsborough County

About Hillsborough County

Hillsborough County is one of the counties of New Hampshire. County governments in New Hampshire handle local services such as courts, property records and elections; cities and towns inside the county run their own municipal services. Population figures come from the Census Bureau's Vintage 2023 estimates, which are updated annually.