New Jersey · FIPS 34023 · County seat: New Brunswick
Middlesex County, NJ GIS & Parcel Viewer
Use this page to reach the official statewide parcel map for Middlesex County, New Jersey. The button below opens NJ Parcels and MOD-IV Composite layer (ArcGIS Map Viewer) in a new tab, so you can look up parcels by address, owner or parcel number on the source site itself.
Open the Middlesex County statewide map ↗
Opens arcgis.com in a new tab. We link out and never embed or copy parcel data.
Map and county facts
| Official map | NJ Parcels and MOD-IV Composite layer (ArcGIS Map Viewer) |
|---|---|
| Type | Statewide map (covers all of New Jersey) |
| Website | arcgis.com |
| Access | Free, no login (checked Oct 2026) |
| County seat | New Brunswick |
| Population | 863,623 (2023 Census Bureau estimate) |
| Land area | 309 sq mi |
| FIPS code | 34023 |
Who runs this map
The link goes to a statewide map (NJ Parcels and MOD-IV Composite layer (ArcGIS Map Viewer)). It shows parcels for Middlesex County along with the rest of New Jersey. Statewide parcel layers are usually stitched together from county files, so the newest splits or sales may show up on the county's own records first. As of our October 2026 test, anyone could open it without signing in or paying.
How to use the Middlesex County viewer
- Open the statewide map with the button above.
- Search for an address in Middlesex County, or zoom to the county on the map.
- Click a parcel to see the attributes the state layer includes.
- Write down the parcel number and use it for records searches with the Middlesex County assessor or recorder.
If an address search comes up empty, try the parcel number from a tax bill or deed instead, or click the lot on the map.
The county in brief
The U.S. Census Bureau estimated Middlesex County's population at 863,623 in 2023, spread over about 309 square miles of land, or roughly 2,795 people per square mile. By population it ranks 2nd of 21 counties in New Jersey. Its county seat is New Brunswick.
Neighboring counties
Parcels close to the edge of Middlesex County can fall in the next county over. Neighboring counties:
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.