County GIS · State lines · October 19, 2026
New York–Pennsylvania Border Counties and Their Parcel Maps
All 19 counties on the New York–Pennsylvania line, with seats, populations and each official parcel map, plus what changes at the line.
Looking for the counties on the New York–Pennsylvania border and their parcel maps? According to the Census Bureau's county adjacency file, 10 New York counties touch 9 Pennsylvania counties along the line. Each one keeps its own property records and its own parcel viewer, so land near the line often means checking two counties in two states.
A farm, hunting tract or lake lot can sit in one state while the road, the neighbors or the rest of the property are in the other. This page lists every county that touches the line on either side, with links to each official parcel map.
New York–Pennsylvania border at a glance
- Counties on the line: 19 (10 in New York, 9 in Pennsylvania)
- With a verified public parcel viewer in our directory: 19 of 19
- Residents, 2023 estimates: about 1,196,221 on the New York side and 611,814 on the Pennsylvania side
- Most populous on each side: Orange County, NY (407,470) and Erie County, PA (267,571)
- Largest by land area: Delaware County, NY (1,443 sq mi) and Bradford County, PA (1,147 sq mi)
New York counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Allegany County | Belmont | 1,029 | 46,651 | Beacon (Schneider Geospatial) |
| Broome County | Binghamton | 706 | 196,077 | county web map |
| Cattaraugus County | Little Valley | 1,308 | 75,600 | ArcGIS Map Viewer |
| Chautauqua County | Mayville | 1,060 | 124,891 | ArcGIS Web AppBuilder |
| Chemung County | Elmira | 407 | 81,325 | ArcGIS Web AppBuilder |
| Delaware County | Delhi | 1,443 | 44,410 | ArcGIS Map Viewer |
| Orange County | Goshen | 812 | 407,470 | county web map |
| Steuben County | Bath | 1,391 | 92,162 | NYS Tax Parcels Public layer in ArcGIS Map Viewer |
| Sullivan County | Monticello | 968 | 79,920 | ArcGIS |
| Tioga County | Owego | 519 | 47,715 | NYS Tax Parcels Public layer in ArcGIS Map Viewer |
Pennsylvania counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Bradford County | Towanda | 1,147 | 59,695 | PASDA Pennsylvania Tax Parcels viewer |
| Erie County | Erie | 799 | 267,571 | county web map |
| McKean County | Smethport | 980 | 39,519 | ArcGIS Web AppBuilder |
| Pike County | Milford | 545 | 61,247 | county web map |
| Potter County | Coudersport | 1,081 | 15,999 | ArcGIS Web AppBuilder |
| Susquehanna County | Montrose | 823 | 38,109 | ArcGIS Web AppBuilder |
| Tioga County | Wellsboro | 1,134 | 40,840 | ArcGIS Web AppBuilder |
| Warren County | Warren | 884 | 37,572 | Vision Government Solutions |
| Wayne County | Honesdale | 726 | 51,262 | ArcGIS Experience Builder |
Which counties face each other
The Census adjacency file pairs counties that share a boundary. Use it to find the county across the line from the one you know:
- Allegany County, NY borders McKean County, PA, Potter County, PA
- Broome County, NY borders Susquehanna County, PA, Wayne County, PA
- Cattaraugus County, NY borders McKean County, PA, Warren County, PA
- Chautauqua County, NY borders Erie County, PA, Warren County, PA
- Chemung County, NY borders Bradford County, PA, Tioga County, PA
- Delaware County, NY borders Wayne County, PA
- Orange County, NY borders Pike County, PA
- Steuben County, NY borders Potter County, PA, Tioga County, PA
- Sullivan County, NY borders Pike County, PA, Wayne County, PA
- Tioga County, NY borders Bradford County, PA, Susquehanna County, PA
What changes when you cross the line
- Different viewers. On the New York side the official maps run on: county web map (2); ArcGIS Map Viewer (2); ArcGIS Web AppBuilder (2); NYS Tax Parcels Public layer in ArcGIS Map Viewer (2); Beacon (Schneider Geospatial) (1); ArcGIS (1). On the Pennsylvania side: ArcGIS Web AppBuilder (4); county web map (2); PASDA Pennsylvania Tax Parcels viewer (1); Vision Government Solutions (1); ArcGIS Experience Builder (1). Search boxes, parcel ID formats and the details shown in pop-ups will differ.
- Different records offices. Deeds, plats and tax bills are kept by the county where the parcel sits.
- Different rules. Zoning, septic permits and property tax are set locally and by each state, so check with the county on the side where you plan to build or buy.
Researching a tract that crosses the line
- Find the parcel in both counties' viewers. Each side will show only its own piece, with its own parcel number.
- Pull the recorded deed from each county's register or recorder, since each county records only the land inside its own boundary.
- Expect two tax bills, one from each county, and check each state's rules for homestead or farm exemptions.
- For a sale, a fence or a building permit, hire a licensed surveyor familiar with the line; tax-map lines are drawings, not surveys.
A quick way to check which side a spot is on
Open the Platbookmapper Land Map, search the nearest county, and tap the spot. The land report shows which county it falls in, along with flood zone, elevation, soil and wetlands, and links to that county's parcel map.
Related guides
- New York GIS maps by county
- New York plat maps
- Pennsylvania county GIS websites by viewer
- Pennsylvania plat maps
More: New York counties · Pennsylvania counties
Sources
- U.S. Census Bureau county adjacency file, used for which counties share the line.
- U.S. Census Bureau Gazetteer files, 2020 county land area.
- U.S. Census Bureau, Population Estimates Program, county totals, Vintage 2023 (July 1, 2023 estimates)
- Platbookmapper county GIS directory (live data file behind our county pages, pulled October 19, 2026) for each county's official parcel viewer.
- County seats: Wikidata (county seat property), cross-checked against Census place names.