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Middlesex County, NJ parcel and infrastructure data API

Korzy has about 280,000 parcel records for Middlesex County, New Jersey, with source updates through July 2026. 90% include land use and 84% include values. In and around the county the API also maps about 65 power plants with about 3,100 MW of capacity, led by natural gas; about 20 data-center projects (9 operating and 1 under construction); and 2 ports with reported cargo. Look up any parcel by address or coordinates, then check nearby data-center projects, utilities and grid context at the same point.

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Parcel coverage in Middlesex County

About 280,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from July 2026. Each record has a stable korzy_id you can store and look up again with /api/parcel-record. Share of records with each field:

FieldCoverageShare
Situs addressNearly all · 99%
Owner nameNot published
Assessed or market valueMost · 84%
Year builtMany · 72%
Building sizeMany · 71%
Last saleMost · 81%
Land useMost · 90%
ZoningNot published

Middlesex County records do not include owner names. See pricing for credit costs.

Infrastructure in and around Middlesex County

Power plants

About 65 operable plants with about 3,100 MW of nameplate capacity; largest by capacity: natural gas, battery and pumped storage, solar. Proposed generators add about 30 MW.

Plant details: /api/power/plants/{plant_id}

Substations and transmission

About 50 in-service substations, about 25 rated 230 kV or higher.

About 320 miles of transmission lines: about 45 mi at 100–161 kV; about 200 mi at 220–287 kV; about 30 mi at 500 kV.

Water and sewer service

Service areas of about 25 community water systems cover about 87% of the county.

Sewer service areas of 7 systems cover about 66%.

At a point: /api/utilities/context

Data-center projects

About 20 tracked projects: 9 operating, 1 under construction, 10 status not reported. Reported operating capacity: about 150 MW.

Within 10 km of a point: /api/datacenters/context

Grid capacity data

1 utility-published grid capacity layer cover parts of Middlesex County, including capacity bands.

Sources and dates: /api/grid/capacity/summary

Flood zones and wetlands

Special flood hazard areas cover about 15% of the county on the current federal flood maps, published September 2026.

Mapped wetlands cover about 16%.

Rail, ports and freight

  • About 240 miles of active rail, about 95 of it main line
  • About 40 miles of national freight network highway
  • 2 port areas with reported cargo tonnage

Within 25 km of a point: /api/logistics/context

Example requests for Middlesex County

Real responses from the production API, trimmed to the main fields. Every request needs an API key with api:read; see authentication and credits and limits.

1. Find a parcel by address

/api/search matches 55 EDGEBORO RD, EAST BRUNSWICK, NJ and returns the parcel's korzy_id, coordinates and record. 1 credit.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'q=55 EDGEBORO RD, EAST BRUNSWICK, NJ' \
  https://api.korzy.co/api/search
Python
import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "55 EDGEBORO RD, EAST BRUNSWICK, NJ"},
    headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
    timeout=30,
)
response.raise_for_status()
parcel = response.json()["results"][0]
print(parcel["korzy_id"], parcel["longitude"], parcel["latitude"])
Response (trimmed)
{
  "results": [
    {
      "korzy_id": "34023-19b816a43c0b775d39aa",
      "address": "55 EDGEBORO RD",
      "city": "EAST BRUNSWICK",
      "postcode": "08816",
      "county": "MIDDLESEX",
      "statefp": "34",
      "longitude": -74.39394072196126,
      "latitude": 40.47475490043286,
      "match_type": "exact",
      "parcelid": "1204_834_4.02",
      "parceladdr": "55 EDGEBORO RD",
      "parcelcity": "EAST BRUNSWICK",
      "situs_zip": "08816",
      "usedesc": "Public School Property (Exempt)",
      "land_use_code": "15C",
      "yearbuilt": 1970,
      "bldgsqft": 5320,
      "taxacres": 3.5996,
      "totalvalue": 381600,
      "land_value_usd": 108000,
      "improvement_value_usd": 273600,
      "saledate": "1992-01-07",
      "saleamt": 650000,
      "updated": "2026-05-18",
      "geoid": "34023"
    }
  ],
  "truncated": false
}

2. Look up the parcel at a point

/api/query/point returns every parcel whose boundary covers the coordinates; here it returns the same record, 34023-19b816a43c0b775d39aa, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-74.393941' \
  --data-urlencode 'latitude=40.474755' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point
JavaScript
const params = new URLSearchParams({"longitude": "-74.393941", "latitude": "40.474755", "limit": "5"});
const response = await fetch(`https://api.korzy.co/api/query/point?${params}`, {
  headers: { Authorization: `Bearer ${process.env.KORZY_API_KEY}` },
});
if (!response.ok) throw new Error(`Korzy API ${response.status}`);
const { records } = await response.json();
console.log(records.map((record) => record.korzy_id));

3. Check nearby data-center projects

/api/datacenters/context lists data-center projects within 10 km of the point, nearest first. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-74.393941' \
  --data-urlencode 'latitude=40.474755' \
  --data-urlencode 'radius_km=10' \
  --data-urlencode 'limit=3' \
  https://api.korzy.co/api/datacenters/context
Python
import os
import requests

response = requests.get(
    "https://api.korzy.co/api/datacenters/context",
    params={"longitude": "-74.393941", "latitude": "40.474755", "radius_km": "10", "limit": "3"},
    headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
    timeout=30,
)
response.raise_for_status()
for project in response.json()["projects"]:
    print(project["name"], project["status"], project["distance_km"])
Response (trimmed)
{
  "projects": [
    {
      "project_id": "dc_153a876542639ff9fa7d",
      "name": "Verizon Wireline Network Building",
      "status": "unknown",
      "state": "NJ",
      "longitude": -74.44309493298871,
      "latitude": 40.49490315,
      "location_precision": "footprint",
      "distance_km": 4.722343443270064
    },
    {
      "project_id": "dc_e0809239e14c189307c8",
      "name": "100 Jersey Avenue Data Center",
      "operator": "Undisclosed (parcels controlled by Amzak Capital Management)",
      "status": "cancelled",
      "city": "New Brunswick",
      "state": "NJ",
      "longitude": -74.4576813,
      "latitude": 40.4884182,
      "location_precision": "approximate",
      "distance_km": 5.600930916145772
    },
    {
      "project_id": "dc_9f6825473c2b7b9943a2",
      "name": "Iron Mountain Data Centers NJE-1",
      "operator": "Iron Mountain",
      "status": "operating",
      "city": "Edison",
      "state": "NJ",
      "longitude": -74.34741660299264,
      "latitude": 40.52082485,
      "location_precision": "footprint",
      "operational_mw": 30,
      "distance_km": 6.458965859460357
    }
  ],
  "radius_km": 10,
  "limit": 3,
  "truncated": true
}

Middlesex County data questions

How many parcels in Middlesex County include year built?
About 200,000 of about 280,000 parcel records (72%) include year built.
Does the Korzy API return owner names for Middlesex County parcels?
Middlesex County parcel records do not include owner names. Values, land use and building facts are returned where the county publishes them.
How many data-center projects are in Middlesex County?
Korzy tracks about 20 data-center projects in Middlesex County: 10 status not reported, 9 operating and 1 under construction. /api/datacenters/context lists projects within 10 km of any point.
How much power generation is in Middlesex County?
About 65 operable power plants in Middlesex County total about 3,100 MW of nameplate capacity, mainly natural gas, battery and pumped storage and solar.
Which water systems serve Middlesex County?
Service areas of about 25 community water systems cover about 87% of Middlesex County, and sewer service areas cover about 66%. /api/utilities/context returns the water and sewer matches at a point.

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Build on Middlesex County parcel data

Search, point and record lookups work the same in every county Korzy covers. Credits are shared across parcels, utilities, environment, logistics and data-center routes.

Get an API keySee pricingAPI referenceUse cases for parcel and infrastructure data