Hamilton County ZIP Codes

Hamilton County is a county of New York.

ZIP codes: 11
Cities & towns: 11
Area codes: 4
Land area: 1,717 sq mi

Every ZIP code in Hamilton County

121xx–134xx

The complete list of Hamilton County, NY ZIP codes with the city each one delivers to.
ZIP code	City
12108	Lake Pleasant
12139	Piseco
12164	Speculator
12190	Wells
12812	Blue Mountain Lake
12842	Indian Lake
12847	Long Lake
12864	Sabael
13353	Hoffmeister
13360	Inlet
13436	Raquette Lake

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Hamilton County codes above are listed without a column we would have to invent.

Cities and towns in Hamilton County

A further 10 places in Hamilton County appear in the postal source without a page of its own; their codes are in the table above and each one links to its own page.

Area codes covering Hamilton County

Telephone and postal boundaries are drawn by different bodies, so these codes overlap the county without matching its edges.

Where Hamilton County's ZIP codes sit

Each point is the reference point of one Hamilton County ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope every ZIP code recorded in Hamilton County. Source GeoNames US postal codes (2026-07 postal dump), Census 2024 county Gazetteer (2024 Gazetteer) and geoinfo-dataset (full_dataset) ZIP→NPA (2018 snapshot). Updated 16 July 2026. The outline is a convex envelope of ZIP reference points, not a jurisdiction boundary.