Long Island

Greenvale, New York

Greenvale is a Census-designated community in Nassau County, part of New York's Long Island region, with about 1,100 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: Nassau
Region: Long Island
Population (2020): 1,069

How Greenvale works

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

Usually, the street address chooses among the towns of North Hempstead and Oyster Bay. Greenvale crosses municipal lines, and 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

Greenvale is mapped so the Census Bureau can publish useful local statistics. The government crosswalk shows that it crosses the towns of North Hempstead and Oyster Bay. Use the exact address to choose the right municipality and county.

Town of North Hempstead page Town of Oyster Bay 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 Hempstead building and zoning Oyster Bay building and zoning North Hempstead assessment Government and office map

The school district is a separate map

The school district is separate from the towns of North Hempstead and Oyster Bay. The exact home address decides enrollment and the school-tax line, even when the mailing address says Greenvale.

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.

Nassau County land records Find the county page

Ordinary example

A resident sees Greenvale on the mailing address

They do not look for a Greenvale village office. They use the street address to choose among the towns of North Hempstead and Oyster Bay, then use the responsible municipality for building or assessment work, the county clerk for the deed, and the school district for enrollment.

Property tax snapshot

Use the current parcel bill for the real number

Nassau County uses four property classes. The state's municipality dataset blends all four classes, so its full-value rate is not a residential-home estimate. Use the parcel's class, current assessment, and newest county, municipal, school, and village bills.

Start with the assessor record and the newest tax bills. Match the exact address to its village, town or city, county, school district, and special districts before comparing totals.

Local government

Greenvale crosses North Hempstead and Oyster Bay.

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 Hempstead town Oyster Bay town

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.

Greenvale is a Census place that crosses more than one municipality. Match the street address to its city or town before using a form, fee, deadline, or tax office.

Assessment, exemptions, and grievance

Assessment guide

This is the office that owns the assessed-value record and local exemption file.

Nassau County Department of Assessment North Hempstead town and Oyster Bay town

Nassau County, not the Town of North Hempstead, owns the county assessment roll.

Nassau County, not the Town of Oyster Bay, owns the county assessment roll.

Clerk, licenses, and municipal records

Marriage guide

Use the clerk for the records and licenses this government actually keeps. A village clerk does not automatically own the town's marriage-license work.

North Hempstead Town Clerk North Hempstead town

Oyster Bay Town Clerk Oyster Bay town

Building, zoning, and land use

Project guide

Start here for local permits, inspections, zoning, and code questions. County health, wetlands, shoreline, or park review can still add another office.

North Hempstead Building Department North Hempstead town

Oyster Bay Building Division Oyster Bay town

Property-tax bills and payments

Match the office to the bill in hand. Village, town or city, county, and school taxes do not always use the same collector.

North Hempstead Receiver of Taxes North Hempstead town

Oyster Bay Receiver of Taxes Oyster Bay town

The listed official office routes were individually reviewed, most recently on July 13, 2026. Confirm current forms, fees, hours, and deadlines with the office before acting.

County records and estate court

Nassau 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.

Official starting points