ParcelioJefferson County, New York: parcel data and property records
49,650 Jefferson County parcels on one searchable map: owner of record and mailing address, assessed and appraised values and recorded sales, plus lot boundaries and location. Screen by absentee ownership, acreage, year built and owner tenure.
What the data covers
These bars show real field-by-field coverage for Jefferson County in our database, so you know exactly what you are getting before you search. Numbers refresh as the county publishes new records.
Not held for Jefferson County: zoning and vacancy. Those fields are carried where the county publishes them.
Most recent recorded sale on file: 2025-05-28.
Areas covered
Parcel counts by place, largest first: Alexandria (3,501), Clayton (3,368), Lyme (3,026), Brownville (2,696), Cape Vincent (2,379).
Nearest counties
- Lewis County: about 31 mi away, 24,689 parcels
- Oswego County: about 38 mi away, 59,567 parcels
- Oneida County: about 60 mi away, 105,058 parcels
- St. Lawrence County: about 60 mi away, 67,717 parcels
- Herkimer County: about 67 mi away, 41,332 parcels
Search Jefferson County parcels
The map is free to browse - parcel lines, boundaries, and location. Owner of record, assessed values, recorded sales, year built and the full parcel report come with a plan that costs less than one hour of a title runner's time.
Explore the Jefferson County map See plans
Common questions
How many parcels are in Jefferson County, New York?
Parcelio carries 49,650 parcel records for Jefferson County, New York, with owner information on 99 percent of them.
Can I find out who owns a property in Jefferson County?
Yes. Search by owner name, address, or parcel number to pull the record: owner of record and mailing address, assessed values, recorded sales, year built and lot lines on the map. Sale records here currently run through 2025-05-28.
How do I find vacant land or absentee owners in Jefferson County?
We do not hold vacancy data for Jefferson County yet, so this filter has nothing to match there. Vacancy filters work in the counties where we hold the field. Jefferson County does have owner mailing state: 4,596 parcels have an owner mailing address outside New York.
Can I search Jefferson County by lot size or acreage?
Yes. Acreage is on 100 percent of Jefferson County parcels, mapped from the parcel boundary, and the advanced search filters on it directly - set a minimum and maximum to pull every tract in that range, then stack vacancy or absentee ownership on top.