47 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Derry town | 1 | 33,908 | 34,307 | -0.5% | 956 | 35.47 | Town |
| Salem town | 2 | 33,283 | 30,281 | 2.67% | 1,340 | 24.84 | Town |
| Londonderry town | 3 | 27,004 | 25,870 | 0.55% | 643 | 42 | Town |
| Derry | 4 | 23,280 | 22,891 | 0.36% | 1,453 | 16.02 | CDP |
| Portsmouth | 5 | 23,227 | 21,992 | 1.07% | 1,483 | 15.66 | City |
| Portsmouth city | 6 | 22,827 | 21,992 | 0.21% | 1,458 | 15.66 | City |
| Hampton town | 7 | 16,298 | 16,234 | -0.39% | 1,262 | 12.91 | Town |
| Exeter town | 8 | 16,098 | 16,043 | -0.23% | 821 | 19.60 | Town |
| Windham town | 9 | 16,086 | 15,836 | 0% | 601 | 26.74 | Town |
| Londonderry | 10 | 12,419 | 12,053 | 0.75% | 1,016 | 12.22 | CDP |
| Raymond town | 11 | 10,942 | 10,702 | -0.14% | 380 | 28.82 | Town |
| Hampton | 12 | 10,149 | 10,002 | 0.33% | 1,864 | 5.45 | CDP |
| Exeter | 13 | 10,087 | 9,349 | 0.56% | 2,244 | 4.50 | CDP |
| Newmarket town | 14 | 9,571 | 9,424 | 0.48% | 760 | 12.59 | Town |
| Hampstead town | 15 | 9,113 | 9,004 | -0.09% | 679 | 13.42 | Town |
| Seabrook town | 16 | 8,355 | 8,407 | -0.35% | 931 | 8.98 | Town |
| Epping town | 17 | 7,783 | 7,151 | 1.47% | 299 | 26.03 | Town |
| Plaistow town | 18 | 7,764 | 7,833 | -0.44% | 733 | 10.59 | Town |
| Stratham town | 19 | 7,672 | 7,695 | -0.57% | 506 | 15.15 | Town |
| Atkinson town | 20 | 7,410 | 7,097 | 0.39% | 664 | 11.16 | Town |
| Sandown town | 21 | 6,722 | 6,551 | 0.48% | 482 | 13.93 | Town |
| Auburn town | 22 | 6,269 | 5,958 | 0.79% | 247 | 25.35 | Town |
| Kingston town | 23 | 6,246 | 6,202 | -0.43% | 316 | 19.79 | Town |
| Newmarket | 24 | 5,962 | 5,737 | 0.74% | 2,649 | 2.25 | CDP |
| Rye town | 25 | 5,567 | 5,544 | -0.34% | 440 | 12.64 | Town |
| Nottingham town | 26 | 5,443 | 5,241 | 0.41% | 117 | 46.50 | Town |
| Chester town | 27 | 5,294 | 5,233 | -0.11% | 204 | 26.01 | Town |
| Deerfield town | 28 | 4,971 | 4,864 | 0.08% | 98 | 50.76 | Town |
| Fremont town | 29 | 4,897 | 4,745 | 0.47% | 285 | 17.17 | Town |
| Brentwood town | 30 | 4,864 | 4,499 | 1.91% | 289 | 16.82 | Town |
| Newton town | 31 | 4,836 | 4,819 | 0.06% | 493 | 9.81 | Town |
| Northwood town | 32 | 4,712 | 4,642 | 0.26% | 167 | 28.16 | Town |
| Danville town | 33 | 4,678 | 4,415 | 1.08% | 402 | 11.65 | Town |
| North Hampton town | 34 | 4,495 | 4,535 | -0.44% | 324 | 13.89 | Town |
| Raymond | 35 | 4,294 | 3,807 | 2.29% | 663 | 6.48 | CDP |
| Candia town | 36 | 4,229 | 4,020 | 0.62% | 139 | 30.34 | Town |
| Greenland town | 37 | 4,089 | 4,066 | -0.22% | 390 | 10.48 | Town |
| Epping | 38 | 3,022 | 3,001 | 3.03% | 703 | 4.30 | CDP |
| Hampton Beach | 39 | 2,744 | 2,485 | 1.18% | 2,157 | 1.27 | CDP |
| East Kingston town | 40 | 2,420 | 2,439 | -0.37% | 244 | 9.92 | Town |
| Hampton Falls town | 41 | 2,371 | 2,406 | -0.59% | 194 | 12.22 | Town |
| Kensington town | 42 | 2,096 | 2,095 | 0.05% | 175 | 11.97 | Town |
| Newfields town | 43 | 1,775 | 1,774 | 0% | 250 | 7.09 | Town |
| New Castle town | 44 | 992 | 995 | -0.4% | 1,226 | 0.81 | Town |
| South Hampton town | 45 | 890 | 889 | -0.34% | 111 | 8.02 | Town |
| Seabrook Beach | 46 | 832 | 976 | -1.3% | 795 | 1.05 | CDP |
| Newfields | 47 | 289 | 254 | 0% | 761 | 0.38 | CDP |
Derry town is the largest city in Rockingham County, with a population of 33,908.
Newfields is the smallest city in Rockingham County.
There are 47 cities in Rockingham County, New Hampshire.