21 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Albany | 1 | 101,994 | 98,609 | 0.67% | 4,765 | 21 | City |
| Colonie | 2 | 86,939 | 85,395 | 0.47% | 1,554 | 56 | Town |
| Troy | 3 | 51,003 | 51,311 | -0.12% | 4,924 | 10 | City |
| Guilderland | 4 | 38,675 | 36,847 | 1.91% | 668 | 58 | Town |
| Bethlehem | 5 | 35,692 | 35,060 | 0.76% | 728 | 49 | Town |
| Cohoes | 6 | 18,635 | 18,107 | 0.57% | 4,939 | 4 | City |
| Watervliet | 7 | 10,245 | 10,357 | -0.22% | 7,634 | 1 | City |
| New Scotland | 8 | 9,351 | 9,081 | 1.09% | 163 | 58 | Town |
| Colonie | 9 | 7,673 | 7,760 | -0.23% | 2,367 | 3 | Village |
| Coeymans | 10 | 7,358 | 7,252 | 0.92% | 147 | 50 | Town |
| Menands | 11 | 4,490 | 4,544 | -0.24% | 1,466 | 3 | Village |
| Westerlo | 12 | 3,281 | 3,190 | 1.02% | 57 | 58 | Town |
| Ravena | 13 | 3,241 | 3,264 | -0.15% | 2,208 | 1 | Village |
| Green Island | 14 | 2,985 | 2,983 | 0.47% | 3,996 | 1 | Town |
| Green Island | 15 | 2,968 | 2,983 | -0.1% | 3,973 | 1 | Village |
| Voorheesville | 16 | 2,847 | 2,839 | 0.04% | 1,331 | 2 | Village |
| Berne | 17 | 2,706 | 2,685 | 0.48% | 42 | 64 | Town |
| Knox | 18 | 2,650 | 2,632 | 0.76% | 63 | 42 | Town |
| Rensselaerville | 19 | 1,882 | 1,826 | 1.07% | 31 | 61 | Town |
| Altamont | 20 | 1,647 | 1,664 | -0.24% | 1,301 | 1 | Village |
| Clarksville | 21 | 954 | 975 | -0.31% | 26 | 36 | Town |
Albany is the largest city in Albany County, with a population of 101,994.
Clarksville is the smallest city in Albany County, with a population of 954.
There are 21 cities in Albany County, New York.