New York · FIPS 36109 · County seat: Ithaca
Tompkins County, NY GIS & Parcel Viewer
Looking for lot lines or a parcel number in Tompkins County, NY? The quickest route is Simple Parcel Viewer for Tompkins County, the county parcel map we keep on file for this county. We link straight to it and add a few tips for getting around.
Open the Tompkins County parcel map ↗
Opens tompkinscounty.maps.arcgis.com in a new tab. We link out and never embed or copy parcel data.
Tompkins County at a glance
| Official map | Simple Parcel Viewer for Tompkins County |
|---|---|
| Type | County-run map |
| Website | tompkinscounty.maps.arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | Ithaca |
| Population | 103,558 (2023 Census Bureau estimate) |
| Land area | 475 sq mi |
| FIPS code | 36109 |
Where the parcel data comes from
Tompkins County runs this viewer (directly or through a contracted vendor), which makes it the closest thing to the source for local parcel lines. When we tested the link in October 2026 it opened with no login and no fee.
How to use the Tompkins County viewer
- Click the button above and wait for the Web AppBuilder viewer to load. Some counties show a terms screen first.
- Search by street address, owner or parcel ID if the search box offers those options.
- Click a lot on the map to read its attributes.
- Turn on aerial imagery from the basemap tool and use the layer list to add things like zoning or flood zones when they're published.
Rural addresses don't always geocode well. When that happens, zoom in by hand and click the parcel, or search by owner name.
The county in brief
The U.S. Census Bureau estimated Tompkins County's population at 103,558 in 2023, spread over about 475 square miles of land, or roughly 218 people per square mile. By population it ranks 28th of 62 counties in New York. Ithaca serves as the county seat.
Counties next to Tompkins County
If the property sits near a county line, the parcel may belong to a neighbor. These counties border Tompkins County:
Maps vs. surveys
Online parcel lines are drawn for tax and planning use. They can be off by several feet, so use a recorded plat or a licensed surveyor for fences, setbacks or a sale.