There are 33 cities in Lewis County, New York.
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 Population | 2020 Population | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Watertown | 1 | 24,027 | 24,546 | -0.54% | 2,660 | 9.0 | City |
| Lowville | 2 | 4,866 | 4,871 | -0.21% | 128 | 37.9 | Town |
| Lowville | 3 | 3,323 | 3,337 | -0.12% | 1,752 | 1.9 | Village |
| Carthage | 4 | 3,247 | 3,315 | -0.52% | 1,339 | 2.4 | Village |
| Croghan | 5 | 3,196 | 3,193 | -0.09% | 18 | 179.0 | Town |
| New Bremen | 6 | 2,778 | 2,785 | -0.14% | 50 | 55.8 | Town |
| Denmark | 7 | 2,631 | 2,640 | -0.15% | 52 | 50.7 | Town |
| Camden | 8 | 2,124 | 2,198 | -0.89% | 872 | 2.4 | Village |
| Boonville | 9 | 1,998 | 2,032 | -0.45% | 1,156 | 1.7 | Village |
| Watson | 10 | 1,784 | 1,793 | -0.11% | 16 | 114.2 | Town |
| West Carthage | 11 | 1,749 | 1,767 | -0.29% | 1,337 | 1.3 | Village |
| West Turin | 12 | 1,682 | 1,683 | -0.06% | 16 | 102.5 | Town |
| Diana | 13 | 1,605 | 1,612 | -0.19% | 12 | 138.2 | Town |
| Leyden | 14 | 1,582 | 1,572 | -0.19% | 47 | 33.4 | Town |
| Martinsburg | 15 | 1,318 | 1,322 | -0.15% | 17 | 75.4 | Town |
| Black River | 16 | 1,229 | 1,260 | -0.65% | 690 | 1.8 | Village |
| Greig | 17 | 1,186 | 1,184 | -0.25% | 13 | 92.5 | Town |
| Lyonsdale | 18 | 1,155 | 1,175 | -0.6% | 17 | 68.2 | Town |
| Lewis | 19 | 834 | 840 | 0% | 13 | 64.4 | Town |
| Turin | 20 | 759 | 763 | -0.39% | 24 | 31.2 | Town |
| Copenhagen | 21 | 660 | 663 | -0.15% | 559 | 1.2 | Village |
| Croghan | 22 | 637 | 640 | -0.16% | 1,492 | 0.4 | Village |
| Port Leyden | 23 | 594 | 594 | 0% | 892 | 0.7 | Village |
| Lyons Falls | 24 | 593 | 596 | -0.17% | 612 | 1.0 | Village |
| Harrisburg | 25 | 476 | 476 | -0.21% | 12 | 39.7 | Town |
| Glen Park | 26 | 444 | 446 | -0.22% | 622 | 0.7 | Village |
| Castorland | 27 | 337 | 339 | -0.3% | 1,000 | 0.3 | Village |
| Pinckney | 28 | 312 | 313 | -0.32% | 8 | 41.0 | Town |
| Constableville | 29 | 302 | 300 | 0% | 267 | 1.1 | Village |
| Deferiet | 30 | 254 | 258 | -0.39% | 376 | 0.7 | Village |
| Osceola | 31 | 242 | 243 | 0% | 3 | 88.4 | Town |
| Turin | 32 | 212 | 214 | -0.47% | 205 | 1.0 | Village |
| Montague | 33 | 95 | 95 | 0% | 1 | 63.8 | 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.
Watertown is the largest city in Lewis County.
Montague is the smallest city in Lewis County.
There are 33 cities in Lewis County, New York.