33 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Manchester | 1 | 117,080 | 115,512 | 0.6% | 3,540 | 33 | City |
| Manchester | 2 | 116,604 | 115,512 | 0.19% | 3,526 | 33 | City |
| Nashua | 3 | 92,574 | 91,197 | 0.79% | 3,002 | 31 | City |
| Nashua | 4 | 92,014 | 91,197 | 0.18% | 2,984 | 31 | City |
| Merrimack | 5 | 29,809 | 26,835 | 1.51% | 915 | 33 | Town |
| Hudson | 6 | 25,969 | 25,371 | 0.71% | 918 | 28 | Town |
| Bedford | 7 | 23,880 | 23,446 | 0.1% | 728 | 33 | Town |
| Goffstown | 8 | 18,475 | 18,564 | -0.07% | 499 | 37 | Town |
| Milford | 9 | 16,620 | 16,138 | 0.54% | 654 | 25 | Town |
| Pelham | 10 | 14,852 | 14,238 | 1.14% | 564 | 26 | Town |
| Amherst | 11 | 11,937 | 11,755 | 0.19% | 352 | 34 | Town |
| Weare | 12 | 9,239 | 9,081 | 0.21% | 156 | 59 | Town |
| Hollis | 13 | 8,768 | 8,363 | 0.25% | 276 | 32 | Town |
| Litchfield | 14 | 8,604 | 8,469 | 0.58% | 577 | 15 | Town |
| Peterborough | 15 | 6,452 | 6,357 | 0.3% | 170 | 38 | Town |
| New Boston | 16 | 6,253 | 6,110 | 0.55% | 146 | 43 | Town |
| Hillsborough | 17 | 6,190 | 5,940 | 1.66% | 142 | 44 | Town |
| Brookline | 18 | 5,850 | 5,646 | 0.6% | 295 | 20 | Town |
| New Ipswich | 19 | 5,440 | 5,210 | 0.65% | 166 | 33 | Town |
| Wilton | 20 | 4,001 | 3,903 | 0.4% | 156 | 26 | Town |
| Antrim | 21 | 2,739 | 2,650 | 0.7% | 77 | 36 | Town |
| Mont Vernon | 22 | 2,694 | 2,597 | 0.41% | 160 | 17 | Town |
| Greenville | 23 | 2,008 | 1,972 | 0.15% | 292 | 7 | Town |
| Deering | 24 | 1,927 | 1,896 | 0.26% | 63 | 31 | Town |
| Hancock | 25 | 1,754 | 1,729 | 0.06% | 59 | 30 | Town |
| Lyndeborough | 26 | 1,719 | 1,698 | 0.41% | 56 | 30 | Town |
| Greenfield | 27 | 1,709 | 1,711 | 0.77% | 65 | 26 | Town |
| Francestown | 28 | 1,650 | 1,607 | 0.3% | 55 | 30 | Town |
| Bennington | 29 | 1,508 | 1,495 | 0.07% | 133 | 11 | Town |
| Mason | 30 | 1,465 | 1,445 | 0.27% | 61 | 24 | Town |
| Temple | 31 | 1,411 | 1,376 | 0.71% | 63 | 22 | Town |
| Sharon | 32 | 353 | 355 | 0% | 23 | 16 | Town |
| Windsor | 33 | 275 | 263 | 0.36% | 33 | 8 | Town |
Manchester is the largest city in Hillsborough County, with a population of 117,080.
Windsor is the smallest city in Hillsborough County, with a population of 275.
There are 33 cities in Hillsborough County, New Hampshire.