Hillsborough County, New Hampshire

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. Its county seats are Manchester and Nashua. Hillsborough is northern New England's most populous county as well as its most densely populated.

 References 

Category:New Hampshire counties
Category:1769 establishments in the Thirteen Colonies
Category:1760s establishments in New Hampshire