Mohawk Valley

South Ilion, New York

South Ilion is a Census-designated community in Herkimer County, part of New York's Mohawk Valley region, with about 119 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: Herkimer
Region: Mohawk Valley
Population (2020): 119

How South Ilion works

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

Usually, the Town of German Flatts is the municipal starting point for an address in South Ilion. 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

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

Town of German Flatts 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.

ORPTS assessor and municipal profiles Government and office map

The school district is a separate map

The current state tax-rate data connects South Ilion with 2 school districts, including Van Hornesville-Owen D. Young, Central Valley. 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.

Herkimer County land records Find the county page

Ordinary example

A resident sees South Ilion on the mailing address

They do not look for a South Ilion village office. They match the parcel to the Town of German Flatts, 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: $18.5–$19.1 per $1,000

The FY2025 state rows for German Flatts town combine county + parent town/city + school district on a full-value basis. On a $300,000 home, that base is about $5,565–$5,733 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

South Ilion is served by German Flatts 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

German Flatts 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.

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

Herkimer 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