7 cities
| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Schenectady | 1 | 70,069 | 68,347 | 0.41% | 6,483 | 11 | City |
| Rotterdam | 2 | 31,737 | 30,528 | 1.21% | 889 | 36 | Town |
| Glenville | 3 | 30,381 | 29,276 | 1.18% | 616 | 49 | Town |
| Niskayuna | 4 | 24,666 | 23,253 | 1.29% | 1,743 | 14 | Town |
| Duanesburg | 5 | 6,164 | 5,869 | 1.5% | 87 | 71 | Town |
| Princetown | 6 | 2,158 | 2,021 | 1.6% | 90 | 24 | Town |
| Delanson | 7 | 309 | 308 | 0% | 480 | 1 | Village |
Schenectady is the largest city in Schenectady County, with a population of 70,069.
Delanson is the smallest city in Schenectady County, with a population of 309.
There are 7 cities in Schenectady County, New York.