Rensselaer County, New York
County seat: Troy · Population 160,510 (2025) · 653 sq mi
Rensselaer County is the 22nd most populous of New York's 62 counties, with 160,510 people (2025 estimate). Its county seat is Troy. The map shows its 8 cities and towns and the 7 neighboring counties.
Rensselaer County facts
- County seat
- Troy
- Population (2025 estimate)
- 160,510 −0.4% since 2020
- Land area
- 653 sq mi 32nd largest of 62
- Water area
- 13 sq mi
- Population density
- 246 per sq mi
- Established
- 1791
- Named after
- Kiliaen van Rensselaer (1586-1643) Netherlands merchant
- Largest city
- Troy 50,912
- Median household income
- $87,915
- Cities and towns
- 8 plus 7 CDPs
- ZIP codes
- 31
- Time zone
- Eastern
- FIPS code
- 36083
Cities and towns in Rensselaer County
Rensselaer County has 8 incorporated cities, towns and villages. Populations count the people living inside Rensselaer County; cities that cross a county line also list the other counties.
| Name | Type | Population 2025 | Also in |
|---|---|---|---|
| Troy (county seat) | City | 50,912 | |
| Rensselaer | City | 9,421 | |
| Hoosick Falls | Village | 3,171 | |
| Castleton-on-Hudson | Village | 1,463 | |
| Nassau | Village | 1,077 | |
| Schaghticoke | Village | 547 | |
| East Nassau | Village | 512 | |
| Valley Falls | Village | 449 |
Unincorporated communities (CDPs)
Census-designated places are communities without their own city government; the county provides their services.
| Community | Population | Also in |
|---|---|---|
| East Greenbush | 6,581 | |
| Hampton Manor | 5,334 | |
| Wynantskill | 3,487 | |
| West Sand Lake | 3,479 | |
| Averill Park | 1,615 | |
| Nassau Lake | 830 | |
| Poestenkill | 744 |
ZIP codes in Rensselaer County
31 ZIP codes reach into Rensselaer County. ZIP codes ignore county lines, so some also cover a neighboring county.
- 12018
- 12022
- 12024 also Columbia County
- 12028 also Washington County
- 12033
- 12040
- 12052
- 12057 also Washington County
- 12061
- 12062 also Columbia County
- 12063
- 12082
- 12090 also Washington County
- 12094 also Washington County
- 12118 also Saratoga County
- 12121
- 12123 also Columbia County
- 12138
- 12140
- 12144
- 12153
- 12154 also Washington County
- 12156 also Columbia County
- 12168
- 12169
- 12180
- 12182
- 12184 also Columbia County
- 12185 also Washington County
- 12196
- 12198
Population of Rensselaer County, 2020–2025
Rensselaer County shrank by 616 people (−0.4%) between April 2020 and July 2025: 946 more deaths than births and a net gain of 213 people from migration.
| Year (July 1) | Population |
|---|---|
| 2020 | 160,889 |
| 2021 | 160,634 |
| 2022 | 159,213 |
| 2023 | 159,605 |
| 2024 | 160,014 |
| 2025 | 160,510 |
Neighboring counties
- Albany County west · 321,225 people
- Columbia County south · 60,168 people
- Washington County north · 59,353 people
- Berkshire County, Massachusetts southeast · 128,224 people
- Bennington County, Vermont northeast · 36,630 people
- Saratoga County northwest · 241,343 people
- Greene County southwest · 47,238 people
Printable Rensselaer County map
The PDF is a vector file with real text: it prints sharp on Letter paper and you can search it for a town. The PNG is 2400 pixels wide for slides and documents. Both are free to use with a credit to WhichCounty.
- PDF (Letter) (126 KB)
- PNG (2400 px) (104 KB)
Paste this code to embed the map on your site:
Sources
- Boundaries: U.S. Census Bureau, 2025 Cartographic Boundary Files (1:500,000).
- Population: Census Bureau county and city estimates, Vintage 2025. CDP populations: American Community Survey 2020–2024.
- Places and ZIP codes: Census Bureau 2026 Gazetteer and 2020 ZIP Code Tabulation Area relationship files.
- County seat, founding year and name origin: Wikidata (CC0), checked against state sources.
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