Tax parcel lookup for Watertown and the Thousand Islands
Jefferson County sits where the North Country meets Lake Ontario and the St. Lawrence River, home to the Thousand Islands region. Watertown, the county seat, is the largest city in the area, with Fort Drum — a major U.S. Army post — also located within the county.
NY Property Peek's dataset includes over 58,000 individual tax parcels across Jefferson County, each with details like year built, square footage, bedroom and bathroom counts, and school district where available — pulled from New York State's statewide tax parcel records.
View the interactive map for Jefferson County →NY Property Peek holds 58,979 tax parcel records for Jefferson County, spread across 42 towns, cities and villages and 15 school districts. The median Jefferson County parcel sits on 0.80 acres, has 1,539 sq ft of finished living space, and dates to 1953. The median full market value on file is $148,800.
Construction dates for the 40,227 Jefferson County parcels whose records name a year built.
| Built | Parcels | Share |
|---|---|---|
| Before 1900 | 9,532 | 24% |
| 1900–1949 | 9,337 | 23% |
| 1950–1979 | 7,300 | 18% |
| 1980–1999 | 6,838 | 17% |
| 2000 or later | 7,220 | 18% |
The most common property classes among the 58,974 Jefferson County parcels that carry one. New York State assigns every parcel a class code describing how it is used.
| Property class | Parcels | Share |
|---|---|---|
| One family year-round residence | 26,175 | 44% |
| Residential vacant land | 5,831 | 10% |
| Seasonal residences | 5,603 | 10% |
| Residential land including a small improvement (not used for living accommodations) | 2,571 | 4% |
| Mobile home | 2,198 | 4% |
Where Jefferson County's parcels are, by the municipality each one is assessed in.
| Municipality | Parcels | Share of county |
|---|---|---|
| City of Watertown | 8,845 | 15% |
| Alexandria | 3,535 | 6% |
| Clayton | 3,102 | 5% |
| Lyme | 3,042 | 5% |
| Brownville | 2,710 | 5% |
| Orleans | 2,706 | 5% |
| Ellisburg | 2,383 | 4% |
| Cape Vincent | 2,282 | 4% |
Every figure above is counted directly from the 58,979 Jefferson County records in this site's copy of New York State's statewide tax parcel dataset — none of it is estimated or modelled. Assessment records are a snapshot of what each assessor filed, so an individual parcel can be out of date or incomplete. Nothing here is a title search or a legal description of a property.