21 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Albany | 1 | 102,671 | 98,609 | 0.66% | 4,797 | 21 | City |
| Colonie | 2 | 87,347 | 85,395 | 0.47% | 1,561 | 56 | Town |
| Troy | 3 | 50,942 | 51,311 | -0.12% | 4,919 | 10 | City |
| Guilderland | 4 | 39,401 | 36,847 | 1.88% | 680 | 58 | Town |
| Bethlehem | 5 | 35,960 | 35,060 | 0.75% | 733 | 49 | Town |
| Cohoes | 6 | 18,741 | 18,107 | 0.57% | 4,967 | 4 | City |
| Watervliet | 7 | 10,223 | 10,357 | -0.21% | 7,618 | 1 | City |
| New Scotland | 8 | 9,452 | 9,081 | 1.08% | 164 | 58 | Town |
| Colonie | 9 | 7,656 | 7,760 | -0.22% | 2,362 | 3 | Village |
| Coeymans | 10 | 7,425 | 7,252 | 0.91% | 148 | 50 | Town |
| Menands | 11 | 4,479 | 4,544 | -0.24% | 1,463 | 3 | Village |
| Westerlo | 12 | 3,314 | 3,190 | 1.01% | 57 | 58 | Town |
| Ravena | 13 | 3,237 | 3,264 | -0.12% | 2,205 | 1 | Village |
| Green Island | 14 | 2,999 | 2,983 | 0.47% | 4,015 | 1 | Town |
| Green Island | 15 | 2,965 | 2,983 | -0.1% | 3,969 | 1 | Village |
| Voorheesville | 16 | 2,849 | 2,839 | 0.07% | 1,332 | 2 | Village |
| Berne | 17 | 2,719 | 2,685 | 0.48% | 42 | 64 | Town |
| Knox | 18 | 2,670 | 2,632 | 0.75% | 64 | 42 | Town |
| Rensselaerville | 19 | 1,902 | 1,826 | 1.06% | 31 | 61 | Town |
| Altamont | 20 | 1,644 | 1,664 | -0.18% | 1,299 | 1 | Village |
| Clarksville | 21 | 951 | 975 | -0.31% | 26 | 36 | Town |
Albany is the largest city in Albany County, with a population of 102,671.
Clarksville is the smallest city in Albany County, with a population of 951.
There are 21 cities in Albany County, New York.