County GIS · State lines · October 19, 2026
New Jersey–New York Border Counties and Their Parcel Maps
All 15 counties on the New Jersey–New York line, with seats, 2023 populations and a link to each official parcel map, plus what changes at the state line.
Looking for the counties on the New Jersey–New York border and their parcel maps? According to the Census Bureau's county adjacency file, 7 New Jersey counties touch 8 New York 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.
Below you will find every county on both sides of the line, who borders whom, and what changes when you cross from one records office to the other.
New Jersey–New York border at a glance
- Counties on the line: 15 (7 in New Jersey, 8 in New York)
- With a verified public parcel viewer in our directory: 15 of 15
- Residents, 2023 estimates: about 4,401,883 on the New Jersey side and 9,997,129 on the New York side
- Most populous on each side: Bergen County, NJ (957,736) and Kings County, NY (2,561,225)
- Largest by land area: Sussex County, NJ (519 sq mi) and Orange County, NY (812 sq mi)
New Jersey counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Bergen County | Hackensack | 233 | 957,736 | county web map |
| Hudson County | Jersey City | 46 | 705,472 | county web map |
| Middlesex County | New Brunswick | 309 | 863,623 | NJ Parcels and MOD-IV Composite layer in ArcGIS Map Viewer (imagery basemap) |
| Monmouth County | Freehold | 468 | 642,799 | ArcGIS Experience Builder |
| Passaic County | Paterson | 186 | 513,395 | NJ Parcels and MOD-IV Composite layer in ArcGIS Map Viewer (imagery basemap) |
| Sussex County | Newton | 519 | 146,132 | county web map |
| Union County | Elizabeth | 103 | 572,726 | county web map |
New York counties on the line
| County | Seat | Land (sq mi) | 2023 pop. | Parcel viewer |
|---|---|---|---|---|
| Bronx County | — | 42 | 1,356,476 | county web map |
| Kings County | — | 69 | 2,561,225 | county web map |
| New York County | — | 23 | 1,597,451 | county web map |
| Orange County | Goshen | 812 | 407,470 | county web map |
| Queens County | — | 109 | 2,252,196 | county web map |
| Richmond County | — | 58 | 490,687 | county web map |
| Rockland County | New City | 173 | 340,807 | county web map |
| Westchester County | White Plains | 431 | 990,817 | ArcGIS Experience Builder |
Which counties face each other
Here is who borders whom across the line, based on the Census Bureau adjacency file:
- Bergen County, NJ borders Bronx County, NY, New York County, NY, Rockland County, NY, Westchester County, NY
- Hudson County, NJ borders Kings County, NY, New York County, NY, Richmond County, NY
- Middlesex County, NJ borders Richmond County, NY
- Monmouth County, NJ borders Queens County, NY, Richmond County, NY
- Passaic County, NJ borders Orange County, NY, Rockland County, NY
- Sussex County, NJ borders Orange County, NY
- Union County, NJ borders Richmond County, NY
What changes when you cross the line
- Different viewers. On the New Jersey side the official maps run on: county web map (4); NJ Parcels and MOD-IV Composite layer in ArcGIS Map Viewer (imagery basemap) (2); ArcGIS Experience Builder (1). On the New York side: county web map (7); 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
Tap the spot on the Platbookmapper Land Map. Its land report names the county and links straight to that county's parcel viewer, plus FEMA flood, USGS elevation, USDA soil and wetland results.
Related guides
More: New Jersey counties · New York 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.