63 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Bridgewater | 1 | 47,499 | 45,878 | 1.34% | 1,490 | 32 | Township |
| Hillsborough | 2 | 46,290 | 43,242 | 1.91% | 848 | 55 | Township |
| Bernards | 3 | 29,077 | 27,769 | 1.25% | 1,201 | 24 | Township |
| Hillsborough | 4 | 27,331 | 20,539 | 7.14% | 3,416 | 8 | CDP |
| Raritan | 5 | 25,848 | 23,532 | 2.21% | 690 | 37 | Township |
| Somerset | 6 | 24,787 | 24,119 | 0.74% | 3,916 | 6 | CDP |
| Montgomery | 7 | 24,569 | 23,635 | 1.3% | 761 | 32 | Township |
| North Plainfield | 8 | 23,366 | 22,749 | 1.27% | 8,324 | 3 | Borough |
| Warren | 9 | 17,332 | 15,886 | 3.05% | 886 | 20 | Township |
| Branchburg | 10 | 15,849 | 14,900 | 1.47% | 790 | 20 | Township |
| Somerville | 11 | 14,945 | 12,357 | 3.58% | 6,392 | 2 | Borough |
| Somerville | 12 | 14,615 | 12,357 | 1.3% | 6,251 | 2 | Borough |
| Bradley Gardens | 13 | 14,380 | 14,714 | 0.08% | 3,202 | 4 | CDP |
| Franklin Park | 14 | 13,458 | 12,738 | 0.08% | 5,166 | 3 | CDP |
| Bound Brook | 15 | 12,815 | 11,952 | 1.36% | 7,715 | 2 | Borough |
| Bound Brook | 16 | 12,803 | 11,952 | 1.27% | 7,708 | 2 | Borough |
| Martinsville | 17 | 12,468 | 11,384 | 0.27% | 1,026 | 12 | CDP |
| Blackwells Mills | 18 | 12,358 | 9,509 | 6.64% | 1,609 | 8 | CDP |
| Manville | 19 | 11,180 | 10,932 | 1.35% | 4,735 | 2 | Borough |
| Manville | 20 | 11,055 | 10,932 | 0.22% | 4,682 | 2 | Borough |
| Basking Ridge | 21 | 9,881 | 7,913 | 7.15% | 1,464 | 7 | CDP |
| East Franklin | 22 | 9,469 | 7,864 | 0.56% | 8,695 | 1 | CDP |
| Raritan | 23 | 8,775 | 7,820 | 2.23% | 4,405 | 2 | Borough |
| Raritan | 24 | 8,668 | 7,820 | 0.98% | 4,351 | 2 | Borough |
| Bedminster | 25 | 8,458 | 8,250 | 1.22% | 324 | 26 | Township |
| Bernardsville | 26 | 8,130 | 7,881 | 1.37% | 633 | 13 | Borough |
| Bernardsville | 27 | 8,054 | 7,881 | 0.42% | 627 | 13 | Borough |
| Bridgewater Center | 28 | 7,632 | 5,386 | 7.13% | 1,308 | 6 | CDP |
| Green Brook | 29 | 7,541 | 7,262 | 1.21% | 1,711 | 4 | Township |
| Belle Mead | 30 | 7,280 | 5,492 | 6.92% | 1,806 | 4 | CDP |
| Lyons | 31 | 6,980 | 5,331 | 7.14% | 1,813 | 4 | CDP |
| Green Knoll | 32 | 6,744 | 6,442 | 0.54% | 1,455 | 5 | CDP |
| Watchung | 33 | 6,715 | 6,443 | 1.65% | 1,116 | 6 | Borough |
| Neshanic Station | 34 | 6,646 | 5,223 | 7.14% | 709 | 9 | CDP |
| Watchung | 35 | 6,646 | 6,443 | 0.61% | 1,105 | 6 | Borough |
| Finderne | 36 | 5,951 | 5,775 | 0.39% | 1,455 | 4 | CDP |
| Franklin Center | 37 | 5,864 | 5,536 | 1.63% | 889 | 7 | CDP |
| South Bound Brook | 38 | 5,073 | 4,853 | 2.18% | 7,865 | 1 | Borough |
| South Bound Brook | 39 | 4,993 | 4,853 | 0.56% | 7,741 | 1 | Borough |
| Six Mile Run | 40 | 3,623 | 3,432 | 0.81% | 485 | 7 | CDP |
| Peapack and Gladstone | 41 | 2,645 | 2,553 | 1.65% | 461 | 6 | Borough |
| Weston | 42 | 2,371 | 1,959 | 3.27% | 1,702 | 1 | CDP |
| Middlebush | 43 | 2,296 | 2,737 | -0.09% | 1,154 | 2 | CDP |
| Liberty Corner | 44 | 2,199 | 2,040 | 7.16% | 1,144 | 2 | CDP |
| Bedminster | 45 | 1,732 | 1,110 | 7.11% | 373 | 5 | CDP |
| Flagtown | 46 | 1,434 | 967 | 7.17% | 840 | 2 | CDP |
| Kingston | 47 | 1,238 | 963 | -1.35% | 661 | 2 | CDP |
| Far Hills | 48 | 947 | 922 | 1.28% | 195 | 5 | Borough |
| Far Hills | 49 | 938 | 922 | 0.32% | 194 | 5 | Borough |
| Rocky Hill | 50 | 764 | 740 | 1.19% | 1,252 | 1 | Borough |
| Rocky Hill | 51 | 758 | 740 | 0.4% | 1,243 | 1 | Borough |
| Neshanic | 52 | 662 | 584 | 7.12% | 185 | 4 | CDP |
| Pluckemin | 53 | 535 | 389 | 7.21% | 772 | 1 | CDP |
| East Millstone | 54 | 532 | 693 | -0.56% | 238 | 2 | CDP |
| Harlingen | 55 | 462 | 481 | 2.44% | 573 | 1 | CDP |
| Millstone | 56 | 461 | 449 | 1.32% | 677 | 1 | Borough |
| Millstone | 57 | 456 | 449 | 0.22% | 670 | 1 | Borough |
| Pleasant Plains | 58 | 426 | 627 | -7.19% | 133 | 3 | CDP |
| Skillman | 59 | 311 | 476 | 1.63% | 212 | 1 | CDP |
| Lamington | 60 | 261 | 46 | 6.97% | 60 | 4 | CDP |
| Zarephath | 61 | 93 | 94 | 8.14% | 231 | 0 | CDP |
| Blawenburg | 62 | 70 | 99 | -16.67% | 115 | 1 | CDP |
| Clyde | 63 | 42 | 212 | -20.75% | 110 | 0 | CDP |
Bridgewater is the largest city in Somerset County, with a population of 47,499.
Clyde is the smallest city in Somerset County, with a population of 42.
There are 63 cities in Somerset County, New Jersey.