(Links below lead to Quick Facts for New Hampshire Counties: People, Business & Geography at U.S. Census Bureau.)
| Area | 7/1/2008 | 7/1/2007 | 7/1/2006 | 7/1/2005 | 7/1/2004 | 7/1/2003 | 7/1/2002 | 7/1/2001 | 7/1/2000 | Census 2000 |
| New Hampshire | 1,315,809 | 1,312,256 | 1,308,824 | 1,300,530 | 1,292,064 | 1,281,260 | 1,270,701 | 1,256,625 | 1,240,361 | 1,235,786 |
|---|---|---|---|---|---|---|---|---|---|---|
| Belknap County | 61,281 | 61,065 | 60,962 | 60,975 | 60,760 | 59,960 | 58,984 | 57,844 | 56,582 | 56,325 |
| Carroll County | 47,408 | 47,249 | 47,086 | 46,685 | 46,540 | 45,724 | 45,111 | 44,221 | 43,909 | 43,666 |
| Cheshire County | 77,170 | 77,304 | 77,260 | 76,826 | 76,545 | 76,006 | 75,015 | 74,384 | 73,988 | 73,825 |
| Coos County | 31,971 | 32,345 | 32,589 | 32,804 | 32,754 | 32,829 | 32,831 | 32,910 | 33,144 | 33,111 |
| Grafton County | 85,921 | 85,331 | 85,186 | 84,671 | 84,036 | 83,239 | 82,502 | 81,887 | 81,796 | 81,743 |
| Hillsborough County | 402,042 | 401,060 | 400,002 | 398,193 | 396,020 | 392,641 | 390,682 | 388,064 | 382,361 | 380,841 |
| Merrimack County | 148,161 | 148,073 | 147,541 | 146,207 | 144,679 | 143,203 | 141,404 | 138,597 | 136,638 | 136,225 |
| Rockingham County | 297,350 | 296,042 | 295,180 | 292,877 | 290,471 | 288,891 | 287,005 | 283,380 | 278,710 | 277,359 |
| Strafford County | 121,914 | 121,211 | 120,496 | 118,981 | 118,186 | 117,038 | 115,979 | 114,472 | 112,680 | 112,233 |
| Sullivan County | 42,591 | 42,576 | 42,522 | 42,311 | 42,073 | 41,729 | 41,188 | 40,866 | 40,553 | 40,458 |
Source: Population Division, U.S. Census Bureau