County · code 36049
Lewis CountyNew York
Lewis County is a county in New York with its seat in Lowville. The county was created on March 28, 1805, from Oneida County and named after Morgan Lewis.
- Founded1805
- County seatLowville
- Named forMorgan Lewis
- Land area1,275 sq mi + 15 sq mi water
- Population26,582 2020 Census
- Parcels mapped24,688 checked 15 October 2026
Where it is
Lewis 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 1805 from Oneida County
An old deed may name a county that no longer exists, or a boundary that has since moved.
Lewis County was established in 1805 from Oneida County. The county was named after Morgan Lewis. Between 1808 and 1813, Lewis County gained territory from Jefferson County in 1808, but then lost land to Jefferson County in 1810 and again in 1813.
- 1805Lewis County created Lewis created from Oneida. · N.Y. Laws 1804, 28th sess., ch. 51, secs. 1-2/p. 73
- 1808Gained territory Lewis gained from Jefferson. · N.Y. Laws 1808, 31st sess., ch. 15/p. 254
- 1810
- 1813
Land and parcels
What the maps cover in Lewis
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 24,688 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, 19,363 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
Lewis 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
Lewis 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 Lewis County.
See your own lot on these maps
Open Lewis 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 Lewis County
- When was Lewis County founded?
- Lewis County was founded in 1805, formed from Oneida County, and named after Morgan Lewis.
- What is the county seat of Lewis County?
- The county seat of Lewis County is Lowville.
- Is there an online parcel map for Lewis County?
- Yes. New York State Geographic Information Systems (GIS) Clearinghouse publishes a parcel map of 24,688 parcels, rated good enough here. You can click any parcel on it in Parcel Chart's free map, no sign-in needed.
- Has Lewis County's boundary or name changed?
- Lewis County was created in 1805 from Oneida County. Since then the Atlas of Historical County Boundaries records 3 later changes, chiefly involving Jefferson County.
- Is my lot in a flood zone?
- We do not have flood maps for Lewis County yet. Look up the address on FEMA's Flood Map Service Center, which shows the effective flood map for any lot.
Nearby