Essex County, MA parcel and infrastructure data API

Parcel coverage in Essex County

About 270,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from November 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:

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

Infrastructure in and around Essex County

Example requests for Essex 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 487 LOCUST ST, DANVERS, MA 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=487 LOCUST ST, DANVERS, MA' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "487 LOCUST ST, DANVERS, MA"},
    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"])

{
  "results": [
    {
      "korzy_id": "25009-edde5408b49722e0bdcb",
      "address": "487 LOCUST ST",
      "city": "DANVERS",
      "postcode": "01923",
      "county": "Essex",
      "statefp": "25",
      "longitude": -70.93872573889405,
      "latitude": 42.608249099999995,
      "match_type": "exact",
      "parcelid": "002 006",
      "parceladdr": "487 LOCUST ST",
      "parcelcity": "DANVERS",
      "situs_zip": "01923",
      "usedesc": "SCHOOL",
      "yearbuilt": 1665,
      "bldgsqft": 6280,
      "taxacres": 1.51,
      "totalvalue": 961900,
      "saledate": "2019-02-19",
      "saleamt": 0,
      "updated": "2026-11-03",
      "geoid": "25009"
    }
  ],
  "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, 25009-edde5408b49722e0bdcb, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-70.938726' \
  --data-urlencode 'latitude=42.608249' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-70.938726", "latitude": "42.608249", "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 water and sewer service

/api/utilities/context returns the water and sewer service areas at the point and the nearest treatment plants. 1 credit.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-70.938726' \
  --data-urlencode 'latitude=42.608249' \
  https://api.korzy.co/api/utilities/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/utilities/context",
    params={"longitude": "-70.938726", "latitude": "42.608249"},
    headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
    timeout=30,
)
response.raise_for_status()
matches = response.json()["matches"]
print([area["name"] for area in matches["water"]])

{
  "longitude": -70.938726,
  "latitude": 42.608249,
  "matches": {
    "water": [
      {
        "feature_id": "water:36597",
        "name": "DANVERS WATER DEPT.",
        "boundary_basis": "System Sourced"
      }
    ],
    "sewer": []
  },
  "nearby_treatment": [
    {
      "feature_id": "treatment:2047",
      "name": "South Essex Sewer District WWTP",
      "distance_km": 10.302010732589192
    },
    {
      "feature_id": "treatment:2053",
      "name": "Ipswich Sewerage Collection System and WWTF",
      "distance_km": 12.317368909923525
    }
  ]
}

Essex County data questions

How many parcels in Essex County include year built?

About 240,000 of about 270,000 parcel records (90%) include year built.

Does the Korzy API return owner names for Essex County parcels?

Essex 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 Essex County?

Korzy tracks 1 data-center project in Essex County: 1 operating. /api/datacenters/context lists projects within 10 km of any point.

How much power generation is in Essex County?

About 35 operable power plants in Essex County total about 1,200 MW of nameplate capacity, mainly natural gas, battery and pumped storage and other fuels.

Which water systems serve Essex County?

Service areas of about 50 community water systems cover about 55% of Essex County, and sewer service areas cover about 30%. /api/utilities/context returns the water and sewer matches at a point.

More featured counties

• Middlesex County, MABorders Essex County · about 530,000 parcels
• Suffolk County, MABorders Essex County · about 200,000 parcels
• Hillsborough County, NHBorders Essex County · about 140,000 parcels
• Rockingham County, NHBorders Essex County · about 140,000 parcels
• Worcester County, MAabout 320,000 parcels
• Norfolk County, MAabout 250,000 parcels

All featured Massachusetts counties