New Hampshire.

1. 01Hillsborough County2025 population estimate 433,415
2. 02Rockingham County2025 population estimate 324,077
3. 03Merrimack County2025 population estimate 158,078
4. 04Strafford County2025 population estimate 135,043
5. 05Grafton County2025 population estimate 93,225
6. 06Cheshire County2025 population estimate 78,269
7. 07Belknap County2025 population estimate 65,147
8. 08Carroll County2025 population estimate 52,784
9. 09Sullivan County2025 population estimate 43,961
10. 10Coos County2025 population estimate 31,343

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