47 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Derry | 1 | 34,109 | 34,080 | 0.14% | 962 | 35 | Town |
| Salem | 2 | 31,793 | 30,288 | 0.38% | 1,280 | 25 | Town |
| Londonderry | 3 | 27,281 | 26,104 | 0.66% | 650 | 42 | Town |
| Derry | 4 | 23,280 | 22,891 | 0.36% | 1,453 | 16 | CDP |
| Portsmouth | 5 | 23,174 | 21,991 | 1.03% | 1,480 | 16 | City |
| Portsmouth | 6 | 23,113 | 21,991 | 0.76% | 1,476 | 16 | City |
| Hampton | 7 | 16,467 | 16,233 | 0.12% | 1,275 | 13 | Town |
| Windham | 8 | 16,344 | 15,837 | 0.84% | 611 | 27 | Town |
| Exeter | 9 | 16,250 | 16,051 | 0.28% | 829 | 20 | Town |
| Londonderry | 10 | 12,419 | 12,053 | 0.75% | 1,016 | 12 | CDP |
| Raymond | 11 | 11,054 | 10,698 | 0.38% | 384 | 29 | Town |
| Hampton | 12 | 10,149 | 10,002 | 0.33% | 1,864 | 5 | CDP |
| Exeter | 13 | 10,087 | 9,349 | 0.56% | 2,244 | 4 | CDP |
| Newmarket | 14 | 9,572 | 9,423 | 0.46% | 760 | 13 | Town |
| Hampstead | 15 | 9,185 | 9,004 | 0.32% | 684 | 13 | Town |
| Seabrook | 16 | 8,462 | 8,405 | 0.36% | 943 | 9 | Town |
| Epping | 17 | 8,040 | 7,152 | 3.12% | 309 | 26 | Town |
| Plaistow | 18 | 7,911 | 7,838 | 0.51% | 747 | 11 | Town |
| Stratham | 19 | 7,760 | 7,692 | 0.04% | 512 | 15 | Town |
| Atkinson | 20 | 7,364 | 7,097 | 0.12% | 660 | 11 | Town |
| Sandown | 21 | 6,780 | 6,553 | 0.91% | 487 | 14 | Town |
| Auburn | 22 | 6,345 | 5,975 | 1.31% | 250 | 25 | Town |
| Kingston | 23 | 6,304 | 6,193 | 0.17% | 318 | 20 | Town |
| Newmarket | 24 | 5,962 | 5,737 | 0.74% | 2,649 | 2 | CDP |
| Rye | 25 | 5,706 | 5,546 | 0.76% | 451 | 13 | Town |
| Nottingham | 26 | 5,543 | 5,245 | 1.35% | 119 | 46 | Town |
| Chester | 27 | 5,337 | 5,239 | 0.28% | 205 | 26 | Town |
| Deerfield | 28 | 5,009 | 4,862 | 0.52% | 99 | 51 | Town |
| Fremont | 29 | 4,943 | 4,745 | 0.9% | 288 | 17 | Town |
| Newton | 30 | 4,857 | 4,819 | 0.29% | 495 | 10 | Town |
| Brentwood | 31 | 4,853 | 4,505 | 1.38% | 289 | 17 | Town |
| Northwood | 32 | 4,726 | 4,643 | 0.51% | 168 | 28 | Town |
| Danville | 33 | 4,674 | 4,415 | 1.06% | 401 | 12 | Town |
| North Hampton | 34 | 4,539 | 4,539 | 0% | 327 | 14 | Town |
| Raymond | 35 | 4,294 | 3,807 | 2.29% | 663 | 6 | CDP |
| Candia | 36 | 4,266 | 4,017 | 1.14% | 141 | 30 | Town |
| Greenland | 37 | 4,148 | 4,066 | 0.53% | 396 | 10 | Town |
| Epping | 38 | 3,022 | 3,001 | 3.03% | 703 | 4 | CDP |
| Hampton Beach | 39 | 2,744 | 2,485 | 1.18% | 2,157 | 1 | CDP |
| East Kingston | 40 | 2,436 | 2,438 | 0% | 246 | 10 | Town |
| Hampton Falls | 41 | 2,399 | 2,404 | 0.13% | 196 | 12 | Town |
| Kensington | 42 | 2,098 | 2,095 | 0.14% | 175 | 12 | Town |
| Newfields | 43 | 1,787 | 1,774 | 0.34% | 252 | 7 | Town |
| New Castle | 44 | 1,005 | 993 | 0.4% | 1,242 | 1 | Town |
| South Hampton | 45 | 893 | 889 | 0% | 111 | 8 | Town |
| Seabrook Beach | 46 | 832 | 976 | -1.3% | 795 | 1 | CDP |
| Newfields | 47 | 289 | 254 | 0% | 761 | 0 | CDP |
Derry is the largest city in Rockingham County, with a population of 34,109.
Newfields is the smallest city in Rockingham County, with a population of 289.
There are 47 cities in Rockingham County, New Hampshire.