Hudson Valley
Mahopac, New York
Mahopac is a hamlet — a community without a village government of its own — in Putnam County, part of New York's Hudson Valley region, with about 8,900 residents at the 2020 census.
Whether you're moving in or you've been here for years, the checks that matter most are the school district, the assessment and STAR, and — outside the cities — the well, the septic, and the flood map.
- Type
- Hamlet (CDP)
- County
- Putnam
- Region
- Hudson Valley
- Population (2020)
- 8,932
Local Almanac
Notes in and around Mahopac
Short, sourced notes tied to this place, its county, or nearby communities.
Nearby · History & Culture
Somers Stands by the Elephant Hotel
Somers's local identity connects Elephant Hotel circus memory with town offices, the historical society, and nearby Muscoot Farm.
Read this note ->Nearby · History & Culture
Kent's Wonder Lake Story Follows Old Bridle Paths
Kent's Wonder Lake side gives the town a quiet landscape of bridle paths, laurel, hemlock, and state-park trails.
Read this note ->Nearby · History & Culture
Carmel Gathers Revolutionary Memory by Lake Gleneida
The Sybil Ludington statue gives Carmel a visible Revolutionary memory on the Lake Gleneida shore.
Read this note ->Nearby · The Outdoors
Fahnestock gives Putnam a big upland park identity
Fahnestock State Park gives Putnam lakes, woods, trails, and a large state-park landscape across the Highlands.
Read this note ->Nearby · History & Culture
Putnam Valley Circles Lake Oscawana
Putnam Valley's identity links its Quincy name, Lake Oscawana, rural roads, and local history collections.
Read this note ->Nearby · History & Culture
Carmel’s Lake Gleneida Gives the Hamlet a Shoreline
Carmel’s central hamlet reads differently when Lake Gleneida is treated as a public landscape marker, not background water.
Read this note ->Nearby · The Outdoors
Lasdon gives Somers a garden-and-memorial landscape
Lasdon Public Gardens and Veterans Memorial gives the Somers area gardens, county parkland, and public memorial space.
Read this note ->Putnam County · History & Culture
Patterson's Story Begins in the Great Swamp
Patterson's local identity is tied to the Great Swamp, a long wetland corridor that filters water, holds wildlife, and shapes private-well country.
Read this note ->Putnam County · History & Culture
Philipstown Carries Foundry Brook and Civil War Iron
Philipstown's Cold Spring story connects Foundry Brook, river shipping, Civil War ordnance, industrial ruins, and a National Historic Landmark landscape.
Read this note ->Property tax snapshot
About $13–$31 per $1,000 in Putnam County
Combined full-value rate — county + town/city + school district, per $1,000 of market value (FY2025). On a $300,000 home that's about $3,967–$9,244 a year before the STAR break. A hamlet has no government of its own — it's taxed at the rates of the town it sits in.
A planning estimate, not a bill. Your exact rate depends on your school district and any village. Confirm with the assessor.
Statewide links
Statewide starting points.
Good to know
- • Your assessed value usually isn't your market value — ask for the equalization rate.
- • Register for STAR; new applicants generally receive a credit instead of an automatic exemption on the bill.
- • Outside the cities, check the well, the septic, and the FEMA flood map before you buy.
Nearby
Nearby places
Tax rates: NYS Dept of Taxation & Finance (ORPTS), Real Property Tax Rates and Levy Data by Municipality, data.ny.gov dataset iq85-sdzs. (FY2025). Population: U.S. Census 2020. Reviewed June 2026. Source data ->
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