Hudson Valley

Armonk, New York

Armonk is a Census-designated community in Westchester County, part of New York's Hudson Valley region, with about 4,500 residents at the 2020 census. Its Census boundary is used for statistics; it is not an incorporated village or a municipal government.

Type
Census place (CDP)
County
Westchester
Region
Hudson Valley
Population (2020)
4,495

How Armonk works

The community name is real. The local government is somewhere else.

Usually, the Town of North Castle is the municipal starting point for an address in Armonk. A Census-designated place is a statistical community, not a separate city, town, or village government.

The Census boundary does not create a town hall

Armonk is mapped so the Census Bureau can publish useful local statistics. The government crosswalk places it in the Town of North Castle. Use the exact address because mailing, school, fire, and other service lines can still differ.

Town of North Castle page Census explanation of CDPs

Permits and local records follow the governing municipality

Building, zoning, local code, assessment, and tax-payment work follows the city or town that serves the parcel. The post office name or CDP name does not prove which counter owns the form.

North Castle official website Government and office map

The school district is a separate map

The current state tax-rate data connects Armonk with 5 school districts, including Byram Hills, Valhalla, Mount Pleasant, and 2 more. District boundaries can cross municipal lines, so the exact address decides enrollment and the school-tax part of the bill.

NYSED school and district profiles New York school-enrollment guide

Mail, fire, school, county, and municipal lines can differ

A mailing name helps locate the community, but the school district, fire or special district, county, and governing municipality each use their own boundary. The county clerk keeps the recorded deed for the parcel's county.

Westchester County land records Find the county page

Ordinary example

A resident sees Armonk on the mailing address

They do not look for an Armonk village office. They match the parcel to the Town of North Castle, use that government's building or assessor route, use the county clerk for the deed, and confirm the school district separately.

Property tax snapshot

Parent-government planning range: $18.3–$24.0 per $1,000

The FY2025 state rows for North Castle town combine county + parent town/city + school district on a full-value basis. On a $300,000 home, that base is about $5,480–$7,198 a year before STAR, exemptions, and special-district charges.

This Census place has no municipal government of its own. The exact address decides which parent government and school-district rows apply. Treat this as a route to the right records, not a bill estimate for a specific parcel.

Local government

Armonk is served by North Castle town.

A census-designated place is a named community for Census purposes, not a separate incorporated municipal government. The city or town layer is the practical local-government starting point.

City or town relationship

North Castle town official site

The Census relationship is geographic. It tells you which city or town overlaps this place; the official municipal pages still control the current division of services.

Assessment and exemptions

ORPTS Municipal Profiles

Confirm the assessing unit in Municipal Profiles. A village can use its own assessment or the town roll, and a CDP follows the assessing municipality rather than the community name alone.

Building, zoning, and local rules

Property office checklist

Check the governing city or town before work begins. Local agreements can put code enforcement, zoning, roads, water, or sewer at different counters.

County records and estate court

Westchester County Clerk Estate path

Deeds and mortgages usually route through the county clerk outside NYC. Probate and administration route through the county Surrogate's Court.

Municipal relationships: U.S. Census Bureau 2020 New York Block Assignment Files. Census source. Confirm current responsibilities on the official village, city, town, and county pages before acting.

Local stories & notes

Notes in and around Armonk

Short, sourced notes tied to this place, its county, or nearby communities.

Browse Stories & Notes ->

Nearby · History & Culture

Mount Kisco Became Its Own Village-Town After the Railroad

Mount Kisco's unusual government shape starts with a railroad village that later separated from Bedford and New Castle.

Read this note ->

Nearby · Cars & Driving

Mount Kisco Parking Has Permit and Meter Layers

Mount Kisco drivers should separate permit parking, meter rules, handicap permits, and enforcement hours before leaving a car downtown or near the station.

Read this note ->

Nearby · History & Culture

Mount Pleasant Follows Pocantico Roads

Rockefeller State Park Preserve gives Mount Pleasant carriage roads, open fields, and Pocantico estate landscape in public view.

Read this note ->
More notes near Armonk
New Castle Walks Greeley Ground in Chappaqua North Castle Is Split by Kensico Reservoir Teatown keeps Ossining-area nature close and specific Kensico Dam Plaza turns water infrastructure into civic space Stone Barns Makes Pocantico Hills Food Culture Visible Jacob Burns Film Center gives Pleasantville a real arts address

Nearby

Nearby places

North Castle

Town · Westchester County · 12,408

Chappaqua

Census place (CDP) · Westchester County · 2,598

Thornwood

Census place (CDP) · Westchester County · 3,960

Pleasantville

Village · Westchester County · 7,513

New Castle

Town · Westchester County · 18,311

Hawthorne

Census place (CDP) · Westchester County · 4,646

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. Source data ->

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