26 zips
| Zip Code | City | Population ↓ |
|---|---|---|
| 12180 | Troy | 54,071 |
| 12144 | Rensselaer | 21,631 |
| 12182 | Troy | 14,273 |
| 12061 | East Greenbush | 9,778 |
| 12033 | Castleton On Hudson | 7,772 |
| 12198 | Wynantskill | 7,337 |
| 12018 | Averill Park | 7,069 |
| 12090 | Hoosick Falls | 5,874 |
| 12123 | Nassau | 4,853 |
| 12196 | West Sand Lake | 3,848 |
| 12154 | Schaghticoke | 2,875 |
| 12138 | Petersburg | 2,826 |
| 12094 | Johnsonville | 2,560 |
| 12121 | Melrose | 2,325 |
| 12052 | Cropseyville | 1,931 |
| 12062 | East Nassau | 1,723 |
| 12185 | Valley Falls | 1,699 |
| 12168 | Stephentown | 1,691 |
| 12140 | Poestenkill | 1,526 |
| 12022 | Berlin | 1,069 |
| 12156 | Schodack Landing | 939 |
| 12153 | Sand Lake | 751 |
| 12063 | East Schodack | 745 |
| 12169 | Stephentown | 407 |
| 12040 | Cherry Plain | 29 |
| 12082 | Grafton | 3 |
The data shown reflect ZCTAs from the US Census. As of 2024, there are 26 ZCTAs in Rensselaer County, New York (US Census).