Map of New Hampshire highlighting Hillsborough County

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

References

  1. ↑ "QuickFacts: Hillsborough County, New Hampshire". United States Census Bureau. Retrieved August 15, 2023.
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