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Essex County, MA parcel and infrastructure data API

Korzy has about 270,000 parcel records for Essex County, Massachusetts, with source updates through November 2026. Nearly every record carries values, last sale and building size; 90% include year built. In and around the county the API also maps about 35 power plants with about 1,200 MW of capacity, led by natural gas; 1 data-center project (1 operating); and about 80 miles of active rail. Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.

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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 /v1/records/{id}. Share of records with each field:

FieldCoverageShare
Situs addressNearly all · 99%
Owner nameNot published
Assessed or market valueNearly all · 99%
Year builtMost · 90%
Building sizeNearly all · 99%
Last saleNearly all · 99%
Land useSome · 9%
ZoningNot published

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

Infrastructure in and around Essex County

Power plants

About 35 operable plants with about 1,200 MW of nameplate capacity; largest by capacity: natural gas, battery and pumped storage, other fuels. Proposed generators add 5 MW.

Within 50 km: /v1/lookup section power; details: /v1/records/{id}

Substations and transmission

About 75 in-service substations, 5 rated 230 kV or higher.

About 170 miles of transmission lines: about 120 mi at 100–161 kV; 2 mi at 220–287 kV; about 35 mi at 345 kV.

Water and sewer service

Service areas of about 50 community water systems cover about 55% of the county.

Sewer service areas of about 15 systems cover about 30%.

At an address or point: /v1/lookup section utilities

Data-center projects

1 tracked project: 1 operating.

Within 10 km: /v1/lookup section datacenters

Grid capacity data

2 utility-published grid capacity layers cover parts of Essex County, including loading forecasts, substation inventory.

Nearby records: /v1/lookup section grid

Flood zones and wetlands

Special flood hazard areas cover about 23% of the county on the current federal flood maps, published October 2026.

Mapped wetlands cover about 18%.

At an address or point: /v1/lookup section environment

Rail, ports and freight

  • About 80 miles of active rail, about 65 of it main line
  • About 65 miles of national freight network highway

Within 25 km: /v1/lookup section logistics

Example requests for Essex County

The lookup response is a real production response, trimmed to the main fields. Every request needs an API key with api:read; see authentication and credits and limits.

1. Find a parcel and its water and sewer service

/v1/lookup matches 487 LOCUST ST, DANVERS, MA and returns the parcel's korzy_id and record, plus the water and sewer service areas at the parcel and the nearest treatment plants. 2 credits.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"address":"487 LOCUST ST, DANVERS, MA","sections":["utilities"]}' \
  https://api.korzy.co/v1/lookup
Python
import os
import requests

response = requests.post(
    "https://api.korzy.co/v1/lookup",
    json={"address": "487 LOCUST ST, DANVERS, MA", "sections": ["utilities"]},
    headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
    timeout=60,
)
response.raise_for_status()
body = response.json()
parcel = body["parcels"]["records"][0]
print(parcel["korzy_id"], body["sections"]["utilities"]["status"])
Production response (trimmed)
{
  "location": {
    "longitude": -70.93872573889405,
    "latitude": 42.608249099999995,
    "address": "487 LOCUST ST, DANVERS",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "25009-edde5408b49722e0bdcb",
        "korzy_id": "25009-edde5408b49722e0bdcb",
        "parcelid": "002 006",
        "parceladdr": "487 LOCUST ST",
        "parcelcity": "DANVERS",
        "situs_zip": "01923",
        "statefp": "25",
        "geoid": "25009",
        "longitude": -70.93872573889405,
        "latitude": 42.608249099999995,
        "usedesc": "SCHOOL",
        "yearbuilt": 1665,
        "bldgsqft": 6280,
        "taxacres": 1.51,
        "totalvalue": 961900,
        "saledate": "2019-02-19",
        "saleamt": 0,
        "updated": "2026-11-03"
      }
    ],
    "truncated": false
  },
  "sections": {
    "utilities": {
      "status": "ok",
      "data": {
        "water": [
          {
            "id": "utility:water:36597",
            "feature_id": "water:36597",
            "name": "DANVERS WATER DEPT.",
            "boundary_basis": "System Sourced"
          }
        ],
        "treatment_plants": [
          {
            "id": "utility:treatment:2047",
            "feature_id": "treatment:2047",
            "name": "South Essex Sewer District WWTP",
            "distance_km": 10.302009745997797
          },
          {
            "id": "utility:treatment:2053",
            "feature_id": "treatment:2053",
            "name": "Ipswich Sewerage Collection System and WWTF",
            "distance_km": 12.317346424098954
          },
          {
            "id": "utility:treatment:2122",
            "feature_id": "treatment:2122",
            "name": "Manchester-By-The-Sea Sewerage Collection System and WWTF",
            "distance_km": 14.15949083817903
          }
        ],
        "truncated": {
          "water": false,
          "sewer": false
        }
      },
      "provenance": [
        {
          "dataset": "water",
          "data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
        },
        {
          "dataset": "sewer",
          "data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
        },
        {
          "dataset": "treatment",
          "data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
        }
      ]
    }
  },
  "credits": {
    "charged": 2,
    "refunded": 0
  }
}

2. Add value and sale fields

/v1/enrich returns the fields you choose for up to 25 parcels per request; here the parcel 25009-edde5408b49722e0bdcb. 1 credit.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"items":[{"korzy_id":"25009-edde5408b49722e0bdcb"}],"fields":["identity","value","sale"]}' \
  https://api.korzy.co/v1/enrich

3. Fetch the record again by ID

/v1/records/{id} returns the stored parcel's full record, without owner fields. 1 credit.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  https://api.korzy.co/v1/records/25009-edde5408b49722e0bdcb
JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("25009-edde5408b49722e0bdcb")}`, {
  headers: { Authorization: `Bearer ${process.env.KORZY_API_KEY}` },
});
if (!response.ok) throw new Error(`Korzy API ${response.status}`);
const { record } = await response.json();
console.log(record.parceladdr, record.usedesc);

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. A /v1/lookup with the datacenters section lists projects within 10 km of any address or 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%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

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Build on Essex County parcel data

Lookups, enrichment and records work the same in every county Korzy covers. Credits are shared across parcels, utilities, environment, logistics, power, grid, data-center and terrain sections.

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