Adirondacks & North Country

Three Mile Bay, New York

Three Mile Bay is a Census-designated community in Jefferson County, part of New York's Adirondacks & North Country region, with about 187 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: Jefferson
Region: Adirondacks & North Country
Population (2020): 187

How Three Mile Bay works

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

Usually, the Town of Lyme is the municipal starting point for an address in Three Mile Bay. 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

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

Town of Lyme 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.

Lyme official website Government and office map

The school district is a separate map

The current state tax-rate data connects Three Mile Bay with 3 school districts, including Thousand Islands, Lyme, General Brown. 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.

Jefferson County land records Find the county page

Ordinary example

A resident sees Three Mile Bay on the mailing address

They do not look for a Three Mile Bay village office. They match the parcel to the Town of Lyme, 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: $13.9–$15.7 per $1,000

The FY2025 state rows for Lyme town combine county + parent town/city + school district on a full-value basis. On a $300,000 home, that base is about $4,184–$4,697 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

Three Mile Bay is served by Lyme 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

Lyme 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

Jefferson 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

Local first, then the state system.

Lyme Town website STAR property-tax break (register / check)ORPTS Municipal Data Portal — assessors & rates New York DMV — registration & licenses DEC — outdoors, wells & environment

County service offices (Jefferson)

Jefferson County directory

County Clerk and land records Real property and tax maps Elections and voter help Public health Social services Emergency management and alerts

Direct official office pages. Reviewed 2026-07-13; confirm current forms, hours, and deadlines before acting.

Local stories & notes

Notes in and around Three Mile Bay

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

Browse Stories & Notes ->

Nearby · Home & Property

Watertown and Brownville Property Questions Start With Jefferson County GIS

For Watertown town or Brownville property questions, Jefferson County's GIS and property-search tools are the practical starting point before calling local offices.

Read this note ->

Nearby · History & Culture