When was Cayuga County founded?

Cayuga County was founded in 1799, formed from Onondaga County, and named after Cayuga people.

What is the county seat of Cayuga County?

The county seat of Cayuga County is Auburn.

Is there an online parcel map for Cayuga County?

Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 39,127 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.

Has Cayuga County's boundary or name changed?

Cayuga County was created in 1799 from Onondaga County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Ontario County, Steuben County and Onondaga County.

Is my lot in a flood zone?

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

County · code 36011

Cayuga CountyNew York

Cayuga County is in New York and was created in 1799 from Onondaga County, with Auburn as its seat. The county was named after the Cayuga people.

Founded1799
County seatAuburn
Named forCayuga people
Land area692 sq mi + 172 sq mi water
Population76,248 2020 Census
Parcels mapped39,127 checked 15 October 2026

Open the free map Click any parcel in Cayuga County: acreage, parcel id, address and who publishes the map. No sign-in.

Updated 19 October 2026

Census outline · seat marked

History

Formed in 1799 from Onondaga County

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

Cayuga County was created from Onondaga County on March 8, 1799. Over the following decades, the county exchanged and lost land to neighboring counties: Ontario and Steuben in 1801 and 1804, Seneca in 1804, and Tompkins in 1817, with minor exchanges with Onondaga in 1828.

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

1799
Cayuga County created Cayuga created from Onondaga.
from Onondaga
8 March 1799 · N.Y. Laws 1798-1799, 22d sess., ch. 26/p. 333
1801
Exchanged territory Cayuga exchanged with Ontario, lost to Steuben.
with Ontario with Steuben
3 April 1801 · N.Y. Laws 1801, 24th sess., ch. 123/p. 290
1804
Lost territory Cayuga lost to Ontario and Steuben, and lost to creation of Seneca.
to Ontario to Steuben to Seneca
24 March 1804 · N.Y. Laws 1804, 27th sess., ch. 31/p. 112
1817
Lost territory Cayuga lost to creation of Tompkins.
to Tompkins
7 April 1817 · N.Y. Laws 1816, 40th sess., ch. 189, sec. 1/p. 197
1828
Exchanged territory Cayuga exchanged small areas with Onondaga.
with Onondaga
15 April 1828 · N.Y. Rev. Stat., 3:14-15

Land and parcels

What the maps cover in Cayuga

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

Parcels Good enough

Lot lines and tax-map numbers for 39,127 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, 45,567 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

Cayuga by the Census

Population

76,248 2020 Census count

Housing units

36,660 2020 Census count

Land area

692 square miles

Water area

172 square miles

People per sq mi

110 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

Cayuga County's official site

We have found the county's site but not its offices yet; start there.

County government

County government
The official website of Cayuga County.
cayugacounty.us

See your own lot on these maps

Open Cayuga 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 Cayuga County

When was Cayuga County founded?: Cayuga County was founded in 1799, formed from Onondaga County, and named after Cayuga people.
What is the county seat of Cayuga County?: The county seat of Cayuga County is Auburn.
Is there an online parcel map for Cayuga County?: Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 39,127 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
Has Cayuga County's boundary or name changed?: Cayuga County was created in 1799 from Onondaga County. Since then the Atlas of Historical County Boundaries records 4 later changes, chiefly involving Ontario County, Steuben County and Onondaga County.
Is my lot in a flood zone?: We do not have flood maps for Cayuga County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.

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