County · code 36075
Oswego CountyNew York
Oswego County is located in New York and has its seat in the city of Oswego. The county was created in 1816 from parts of Oneida and Onondaga counties.
- Founded1816
- County seatOswego
- Named forOswego River, New York state
- Land area952 sq mi + 360 sq mi water
- Population117,525 2020 Census
- Parcels mapped59,567 checked 15 October 2026
Where it is
Oswego 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.
History
Formed in 1816 from Oneida County and Onondaga County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Oswego County was formed on March 1, 1816, from portions of Oneida County and Onondaga County. The county is named after the Oswego River.
- 1816Oswego County created Oswego created from Oneida and Onondaga. · N.Y. Laws 1816, 39th sess., ch. 22, sec. 1/p. 16
Land and parcels
What the maps cover in Oswego
Who publishes each layer, how good it is, and when we last checked.
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Parcels Good enough
Lot lines and tax-map numbers for 59,567 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, 73,507 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
Oswego by the Census
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
County government
- County government
The official website of Oswego County.
See your own lot on these maps
Open Oswego 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.
Questions
Common questions about Oswego County
- When was Oswego County founded?
- Oswego County was founded in 1816, formed from Oneida County and Onondaga County, and named after Oswego River, New York state.
- What is the county seat of Oswego County?
- The county seat of Oswego County is Oswego.
- Is there an online parcel map for Oswego County?
- Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 59,567 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Oswego County's boundary or name changed?
- Oswego County was created in 1816 from Oneida County and Onondaga County. The Atlas of Historical County Boundaries records no boundary change since.
- Who issues building permits in Oswego County?
- The county's page on building permits: Pistol Permits. Inside a city or town, ask that city first.
- Is my lot in a flood zone?
- We do not have flood maps for Oswego County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby