New Hampshire Counties by Population

The most populated counties in New Hampshire are Hillsborough County with 422,733, Rockingham County at 315,169, Merrimack County with 153,918, Strafford County at 130,965, and Grafton County with 90,836. You can get the most current Census population data for all 10 New Hampshire counties, sorted from the most populous counties in New Hampshire to the least, according to the 2022 American Community Survey.

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