Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | 2024 Pop. | 2020 Pop. | Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Derry | 1 | 34,078 | 34,307 | -0.5% | 961 | 35.5 | Town |
| Salem | 2 | 32,416 | 30,281 | 2.75% | 1,305 | 24.8 | Town |
| Londonderry | 3 | 26,856 | 25,870 | 0.55% | 639 | 42.0 | Town |
| Portsmouth | 4 | 22,780 | 21,992 | 0.21% | 1,455 | 15.7 | City |
| Hampton | 5 | 16,361 | 16,234 | -0.38% | 1,267 | 12.9 | Town |
| Exeter | 6 | 16,135 | 16,043 | -0.23% | 823 | 19.6 | Town |
| Windham | 7 | 16,086 | 15,836 | 0% | 601 | 26.7 | Town |
| Raymond | 8 | 10,957 | 10,702 | -0.14% | 380 | 28.8 | Town |
| Newmarket | 9 | 9,525 | 9,424 | 0.48% | 756 | 12.6 | Town |
| Hampstead | 10 | 9,121 | 9,004 | -0.09% | 680 | 13.4 | Town |
| Seabrook | 11 | 8,384 | 8,407 | -0.34% | 934 | 9.0 | Town |
| Plaistow | 12 | 7,798 | 7,833 | -0.43% | 736 | 10.6 | Town |
| Stratham | 13 | 7,716 | 7,695 | -0.57% | 509 | 15.1 | Town |
| Epping | 14 | 7,670 | 7,151 | 1.49% | 295 | 26.0 | Town |
| Atkinson | 15 | 7,381 | 7,097 | 0.39% | 662 | 11.2 | Town |
| Sandown | 16 | 6,690 | 6,551 | 0.48% | 480 | 13.9 | Town |
| Kingston | 17 | 6,273 | 6,202 | -0.43% | 317 | 19.8 | Town |
| Auburn | 18 | 6,220 | 5,958 | 0.79% | 245 | 25.4 | Town |
| Rye | 19 | 5,586 | 5,544 | -0.34% | 442 | 12.6 | Town |
| Nottingham | 20 | 5,421 | 5,241 | 0.41% | 117 | 46.5 | Town |
| Chester | 21 | 5,300 | 5,233 | -0.11% | 204 | 26.0 | Town |
| Deerfield | 22 | 4,967 | 4,864 | 0.08% | 98 | 50.8 | Town |
| Fremont | 23 | 4,874 | 4,745 | 0.47% | 284 | 17.2 | Town |
| Newton | 24 | 4,833 | 4,819 | 0.06% | 493 | 9.8 | Town |
| Brentwood | 25 | 4,773 | 4,499 | 1.94% | 284 | 16.8 | Town |
| Northwood | 26 | 4,700 | 4,642 | 0.26% | 167 | 28.2 | Town |
| Danville | 27 | 4,628 | 4,415 | 1.09% | 397 | 11.6 | Town |
| North Hampton | 28 | 4,515 | 4,535 | -0.44% | 325 | 13.9 | Town |
| Candia | 29 | 4,203 | 4,020 | 0.62% | 139 | 30.3 | Town |
| Greenland | 30 | 4,098 | 4,066 | -0.22% | 391 | 10.5 | Town |
| East Kingston | 31 | 2,429 | 2,439 | -0.37% | 245 | 9.9 | Town |
| Hampton Falls | 32 | 2,385 | 2,406 | -0.58% | 195 | 12.2 | Town |
| Kensington | 33 | 2,095 | 2,095 | 0.05% | 175 | 12.0 | Town |
| Newfields | 34 | 1,775 | 1,774 | 0% | 250 | 7.1 | Town |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Derry is the largest city in Rockingham County.
Newfields is the smallest city in Rockingham County.
There are 34 cities in Rockingham County, New Hampshire.