When was Oneida County founded?

Oneida County was founded in 1798, formed from Herkimer County, and named after Oneida.

What is the county seat of Oneida County?

The county seat of Oneida County is Utica.

Is there an online parcel map for Oneida County?

Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 105,058 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Oneida County's boundary or name changed?

Oneida County was created in 1798 from Herkimer County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Chenango County, Clinton County and Jefferson County.

Is my lot in a flood zone?

We do not have flood maps for Oneida County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Oneida County, New York: parcels, history and offices

Where it is

Oneida on the map of New York

New York has 62 counties and county equivalents, each with its own records office. Shapes with a page are links.

Counties of New York · Oneida highlighted

History

Formed in 1798 from Herkimer County

An old deed may name a county that no longer exists, or a boundary that has since moved.

Oneida County was created from Herkimer County on March 15, 1798. Over the following decades, the county lost territory to the creation of Jefferson and Lewis counties in 1805, to the creation of Oswego County in 1816, and to Madison County in 1836. The county was named after the Oneida people.

Boundary changes from the Newberry Library, Atlas of Historical County Boundaries.

1798
Oneida County created Oneida created from Herkimer.
from Herkimer
15 March 1798 · N.Y. Laws 1798, 21st sess., ch. 31/p. 170
1801
Gained territory Oneida gained eastern end of Lake Ontario, lost to Clinton.
from Clinton
3 April 1801 · N.Y. Laws 1801, 24th sess., ch. 123/p. 290
1804
Gained territory Oneida gained from Chenango.
from Chenango
4 April 1804 · N.Y. Laws 1804, 27th sess., ch. 50/p. 172
1805
Lost territory Oneida lost to creation of Jefferson and Lewis.
to Jefferson to Lewis
28 March 1805 · N.Y. Laws 1804, 28th sess., ch. 51, secs. 1-2/p. 73
1816
Lost territory Oneida lost to creation of Oswego.
to Oswego
1 March 1816 · N.Y. Laws 1816, 39th sess., ch. 22, sec. 1/p. 16
1836
Lost territory Oneida lost to Madison.
to Madison
20 May 1836 · N.Y. Laws 1836, 59th sess., ch. 393/p. 588
1879
Boundary clarified Boundary between Oneida and Madison was redefined (no change).
with Madisonno change
20 March 1879 · N.Y. Laws 1879, 102d sess., ch. 91/p. 137

Land and parcels

What the maps cover in Oneida

Who publishes each layer, how good it is, and when we last checked.

Parcels Good enough

Lot lines and tax-map numbers for 105,058 parcels from New York State Geographic Information Systems (GIS) Clearinghouse. Drawn for tax purposes: usually within a few feet of a survey, but not a survey.
edited 25 September 2026 · checked 15 October 2026
Address points Official

One point per address, 94,714 in all from NYS Office of Information Technology Services (ITS), Geospatial Services / GIS Program Office (AGOL org 'ShareGIS NY', owner NYSGIS_GPO).
edited 25 September 2026 · checked 14 October 2026
Buildings Reference

Roof outlines traced from aerial imagery from FEMA Response Geospatial Office with Oak Ridge National Laboratory (ORNL). Good for seeing what is on a lot; not accurate enough to set a fence from.
checked 18 October 2026

Official: from the office that keeps the record
Good enough: a reliable statewide or national copy
Fallback: a guide only; check the official record
Missing: nothing public found yet

People and land

Oneida by the Census

Population

232,125 2020 Census count

Housing units

104,919 2020 Census count

Land area

1,212 square miles

Water area

45 square miles

People per sq mi

191 population ÷ land area

Source: US Census Bureau, 2020 Census; US Census Bureau, 2020 Gazetteer Files. Not endorsed or certified by the Census Bureau.

Rules and offices

Who to ask before you build, dig or sell

Official county pages only. We link to them; we do not copy them, because they change.

Inside a city or town, permits usually come from that city rather than the county.

Permits

Septic System Replacement Fundsfrom oneidacountyny.gov
Public Water Supply and Sewage Programfrom oneidacountyny.gov

Zoning and code

Land Use & Zoningfrom oneidacountyny.gov
Land Use Training Workshopsfrom oneidacountyny.gov

County government

County government
The official website of Oneida County.
ocgov.net

See your own lot on these maps

Open Oneida County on Parcel Chart's free map and click your parcel. Save it with a free account; the full record of your place (site map, projects, documents) is Pro, in early access.

Open the free map no sign-in Pro early access

Questions

Common questions about Oneida County

When was Oneida County founded?: Oneida County was founded in 1798, formed from Herkimer County, and named after Oneida.
What is the county seat of Oneida County?: The county seat of Oneida County is Utica.
Is there an online parcel map for Oneida County?: Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 105,058 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Oneida County's boundary or name changed?: Oneida County was created in 1798 from Herkimer County. Since then the Atlas of Historical County Boundaries records 5 later changes, chiefly involving Chenango County, Clinton County and Jefferson County.
Is my lot in a flood zone?: We do not have flood maps for Oneida County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

Nearby

Oneida CountyNew York