Poestenkill is a town in Rensselaer County, New York, home to about 4,327 people across 32 square miles. Its ZIP code is 12140, and parts of 12018, 12138 and 12198 are in Poestenkill too.
Homes sold for a median of $275 per square foot in the three months ending August 2026.
All in Poestenkill
Mostly Sand Lake; part is in Poestenkill
Mostly Petersburgh; part is in Poestenkill
Mostly North Greenbush; part is in Poestenkill
Each card is that ZIP code’s whole market, including any part outside Poestenkill. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Poestenkill’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | Albany International Airport (ALB)15 miles away |
|---|---|
| Nearest city of 250,000+ | Boston, MA129 miles away |
| Nearest city of 1 million+ | New York, NY141 miles away |
Straight-line distances from the center of Poestenkill; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Poestenkill had 4,322 residents in the 2020 census, up 7% since 2000.
It’s the 402nd largest of 1,007 towns in New York by population.
Rensselaer County grew from 121,697 residents in 1900 to 161,130 in 2020.
Rensselaer County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 78°F in summer, and winter lows average 14°F. About 47.1 inches of rain and melted snow fall in a typical year.
Source: NOAA 1991–2020 climate normals, Grafton, NY weather station (8 miles away).
46,817 jobs at 2,985 businesses in Rensselaer County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2023 (private employers; jobs counted where people work).
7 doctors and other health care providers list an office in Poestenkill.
Nearest hospitals
Providers with an office here
| Specialist doctors | 1 |
|---|---|
| Nurse practitioners and physician assistants | 1 |
| Mental health providers | 4 |
| Physical and occupational therapists | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (3 nearby)
Grocery stores
Pharmacies (1 nearby)
Libraries (2 nearby)
Museums
Theaters and performance venues (1 nearby)
Counts are within about 4 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1770.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Averill Park Central School District. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Poestenkill Elementary SchoolPoestenkill | K–5 | 334 | Public | 3.0 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with North Greenbush, Sand Lake, Petersburgh, Nassau, Berlin, Grafton, Brunswick and Stephentown.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.