Hillsborough County, New Hampshire

county in New Hampshire, United States

Hillsborough County is the most populous county in the U.S. state of New Hampshire. As of the 2010 census, the population was 400,721.[1] The population was estimated at 407,761 in 2016.[2] Its county seats are Manchester and Nashua. Hillsborough is northern New England's most populous county as well as its most densely populated.

Map of New Hampshire highlighting Hillsborough County


  1. "State & County QuickFacts". United States Census Bureau. Archived from the original on May 26, 2013. Retrieved September 24, 2013.
  2. "Population and Housing Unit Estimates". Retrieved June 9, 2017.