ZIP codes

ZIP codes in Schenectady County, New York

Schenectady County has 17 ZIP codes. 6 lie entirely inside it and 11 are shared with neighboring counties, so part of their land and their people are elsewhere. About 162,554 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 17; 2 more just touch the border (under 1% of their land)
Entirely inside: 6; 99% or more of their land
Shared with other counties: 11; Most with Albany County (5)
Most populated ZIP: 12309; 33,246 people · Niskayuna
Least populated ZIP: 12008; 422 people · East Glenville
Largest ZIP by land: 12053; 56 sq mi · Mariaville Lake

Map of the ZIP codes in Schenectady County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Schenectady County

17 ZIP codes in Schenectady County, NY, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
12008	East Glenville	422	100%	422
12010	Amsterdam	27,750	6.0%	≈ 604
12019	Country Knolls	15,555	2.2%	≈ 969
12027	East Glenville	4,693	12%	≈ 1,266
12053	Mariaville Lake	4,550	68%	≈ 3,403
12056	Duane Lake	1,695	100%	1,695
12066	Esperance	1,863	23%	≈ 527
12137	Mariaville Lake	2,077	82%	≈ 1,889
12150	—	710	100%	710
12302	East Glenville	28,031	91%	≈ 27,355
12303	Rotterdam	29,360	29%	≈ 18,913
12304	Schenectady	22,403	66%	≈ 19,114
12305	Schenectady	7,356	100%	7,356
12306	Rotterdam	27,865	96%	≈ 26,795
12307	Schenectady	7,050	100%	7,050
12308	Schenectady	15,511	100%	15,511
12309	Niskayuna	33,246	82%	≈ 28,921

They also touch the county with under 1% of their land, so they aren’t counted: 12009 and 12157.

ZIP codes shared with other counties

These 11 ZIP codes have part of their land in another county. The first figure is the share of their land in Schenectady County; then, where the rest lies.

12010 (Amsterdam): 6.0% here; 64% in Montgomery County, 19% in Fulton County, and 12% in Saratoga County.
12019 (Country Knolls): 2.2% here; 98% in Saratoga County.
12027 (East Glenville): 12% here; 88% in Saratoga County.
12053 (Mariaville Lake): 68% here; 17% in Albany County, 13% in Schoharie County, and 2.3% in Montgomery County.
12066 (Esperance): 23% here; 47% in Montgomery County and 30% in Schoharie County.
12137 (Mariaville Lake): 82% here; 18% in Montgomery County.
12302 (East Glenville): 91% here; 9.0% in Saratoga County.
12303 (Rotterdam): 29% here; 71% in Albany County.
12304 (Schenectady): 66% here; 34% in Albany County.
12306 (Rotterdam): 96% here; 4.3% in Albany County.
12309 (Niskayuna): 82% here; 19% in Albany County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Schenectady (4), East Glenville (3), Mariaville Lake (2), Rotterdam (2), Amsterdam (1), and Country Knolls (1); 9 places in all.

They start with 3 different three-digit prefixes, one per USPS sorting center: 120, 121, and 123.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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