There are 25 cities in Rensselaer 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 |
|---|---|---|---|---|---|---|---|
| Troy | 1 | 50,370 | 51,318 | -0.47% | 4,863 | 10.4 | City |
| East Greenbush | 2 | 16,420 | 16,699 | -0.19% | 684 | 24.0 | Town |
| North Greenbush | 3 | 13,285 | 13,289 | 0.25% | 717 | 18.5 | Town |
| Schodack | 4 | 12,840 | 12,943 | -0.11% | 207 | 61.9 | Town |
| Brunswick | 5 | 12,419 | 12,580 | -0.13% | 280 | 44.4 | Town |
| Rensselaer | 6 | 9,342 | 9,212 | 0.34% | 2,939 | 3.2 | City |
| Sand Lake | 7 | 8,290 | 8,338 | 0% | 237 | 35.0 | Town |
| Schaghticoke | 8 | 7,276 | 7,393 | -0.29% | 146 | 49.7 | Town |
| Hoosick | 9 | 6,623 | 6,702 | -0.03% | 105 | 63.0 | Town |
| Pittstown | 10 | 5,412 | 5,525 | -0.35% | 88 | 61.6 | Town |
| Mechanicville | 11 | 5,064 | 5,163 | -0.49% | 6,036 | 0.8 | City |
| Nassau | 12 | 4,465 | 4,541 | -0.22% | 100 | 44.4 | Town |
| Poestenkill | 13 | 4,296 | 4,312 | 0.07% | 133 | 32.4 | Town |
| Hoosick Falls | 14 | 3,133 | 3,204 | -0.57% | 1,961 | 1.6 | Village |
| Stephentown | 15 | 2,747 | 2,785 | -0.25% | 47 | 57.9 | Town |
| Grafton | 16 | 2,084 | 2,052 | 0.58% | 47 | 44.7 | Town |
| Berlin | 17 | 1,793 | 1,808 | 0% | 30 | 59.6 | Town |
| Valatie | 18 | 1,729 | 1,649 | 1.17% | 1,379 | 1.3 | Village |
| Castleton-on-Hudson | 19 | 1,452 | 1,467 | -0.27% | 2,034 | 0.7 | Village |
| Petersburgh | 20 | 1,366 | 1,374 | 0.07% | 33 | 41.6 | Town |
| Nassau | 21 | 1,074 | 1,102 | -0.65% | 1,536 | 0.7 | Village |
| Round Lake | 22 | 867 | 815 | 1.52% | 773 | 1.1 | Village |
| Schaghticoke | 23 | 546 | 558 | -0.55% | 720 | 0.8 | Village |
| East Nassau | 24 | 511 | 522 | -0.58% | 105 | 4.9 | Village |
| Valley Falls | 25 | 447 | 457 | -0.67% | 965 | 0.5 | Village |
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.
Troy is the largest city in Rensselaer County.
Valley Falls is the smallest city in Rensselaer County.
There are 25 cities in Rensselaer County, New York.