How many zip codes are in Hamilton County New York?

Hamilton County, New York contains 11 zip codes.

What is the county seat of Hamilton County?

The county seat of Hamilton County, New York is Lake Pleasant.

What cities are in Hamilton County?

Hamilton County USPS city names in this directory include Indian Lake, Wells, Long Lake, Speculator, Lake Pleasant, Blue Mountain Lake, Piseco, Inlet and 3 more. The county seat is Lake Pleasant.

What is the population of Hamilton County?

The population of Hamilton County, New York is approximately 4,089.

What zip codes are in Hamilton County?

Hamilton County contains 11 zip codes: 11 standard delivery ZIPs. Browse the table on this page for the complete list.

Hamilton County, New York Zip Codes

📍 Hamilton County has 11 zip codes with a population of 4,089.

County

Hamilton

County Seat

Lake Pleasant

Zip Codes

Population

4,089

Hamilton County is located in New York with a land area of 1,570 square miles. The county seat is Lake Pleasant. Below you'll find all 11 zip codes in Hamilton County with population, income and home value, the county's affordability profile, and links to its 11 city pages.

Population and demographic data sourced from the U.S. Census Bureau American Community Survey (ACS) 5-Year Estimates. ZIP code routing data sourced from the United States Postal Service (USPS).

All Hamilton County Zip Codes

ZIP Code	City	County	Population	Median Income	Median Home	Details
12108	Lake Pleasant	Hamilton	396	$76,786	$275,000	View →
12139	Piseco	Hamilton	243	$91,250	$270,600	View →
12164	Speculator	Hamilton	520	$58,594	$185,200	View →
12190	Wells	Hamilton	683	$55,568	$253,400	View →
12812	Blue Mountain Lake	Hamilton	265	$170,156	$392,900	View →
12842	Indian Lake	Hamilton	952	$60,592	$227,400	View →
12847	Long Lake	Hamilton	667	$72,700	$261,700	View →
12864	Sabael	Hamilton	9	—	—	View →
13353	Hoffmeister	Hamilton	54	$79,375	$125,000	View →
13360	Inlet	Hamilton	193	$117,708	$295,300	View →
13436	Raquette Lake	Hamilton	107	$74,167	$275,000	View →

Hamilton County at a Glance

Residents (ZIPs with data)

4,089

Median household income

$75,477

Median home value

$266,150

Price-to-income ratio

3.4

Median rent

$763

Owner-occupied

84%

Bachelor's degree+

30%

Poverty rate

6.3%

Hamilton County has 11 ZIP codes in this directory: 11 standard delivery ZIPs. The 10 ZIPs with published Census housing data cover 4,089 residents, the largest being 12842 (Indian Lake) with 952 people.

The median ZIP in Hamilton County has a household income of $75,477 and a home value of $266,150, a price-to-income ratio of 3.4, above the 2.9 New York ZIP median. Affordability ranges from 13353 in Hoffmeister at a ratio of 1.6 to 12812 in Blue Mountain Lake, where the median home is $392,900. The highest median income is in 12812 (Blue Mountain Lake) at $170,156. Median rent across these ZIPs is $763 a month.

84% of households in the typical Hamilton County ZIP own their home (statewide ZIP median 80%). 30% of adults hold a bachelor's degree, in line with the 31% statewide median. The median poverty rate is 6.3%, below the 9.9% statewide ZIP median. Overall density is about 3 residents per square mile across 1,570 square miles of ZIP land area.

Medians are taken across the ZIP codes listed below (each ZIP weighted equally); PO Box and no-data ZIPs are excluded. Definitions on the methodology page; statewide comparisons in the 2026 New York ZIP Code Affordability Report.