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Hampden County, MA parcel and infrastructure data API

Korzy has about 160,000 parcel records for Hampden County, Massachusetts, with source updates through November 2026. 75% include values and 75% include last sale. In and around the county the API also maps about 80 power plants with about 1,400 MW of capacity, led by natural gas; 3 data-center projects (1 operating); and about 140 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 Hampden County

About 160,000 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 valueMost · 75%
Year builtMany · 69%
Building sizeMany · 68%
Last saleMost · 75%
Land useMany · 61%
ZoningNot published

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

Infrastructure in and around Hampden County

Power plants

About 80 operable plants with about 1,400 MW of nameplate capacity; largest by capacity: natural gas, battery and pumped storage, solar. Proposed generators add about 10 MW.

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

Substations and transmission

About 40 in-service substations, 3 rated 230 kV or higher.

About 260 miles of transmission lines: 7 mi at under 100 kV; about 190 mi at 100–161 kV; about 55 mi at 345 kV.

Water and sewer service

Service areas of about 35 community water systems cover about 27% of the county.

Sewer service areas of 8 systems cover about 22%.

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

Data-center projects

3 tracked projects: 1 operating, 2 proposed. Reported operating capacity: about 15 MW. Reported planned capacity: about 60 MW.

Within 10 km: /v1/lookup section datacenters

Grid capacity data

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

Nearby records: /v1/lookup section grid

Flood zones and wetlands

Special flood hazard areas cover about 7% of the county on the current federal flood maps, published October 2026.

Mapped wetlands cover about 5%.

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

Rail, ports and freight

  • About 140 miles of active rail, about 100 of it main line
  • About 80 miles of national freight network highway
  • 1 intermodal rail terminal

Within 25 km: /v1/lookup section logistics

Example requests for Hampden 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 425 ST JAMES AV, SPRINGFIELD, 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":"425 ST JAMES AV, SPRINGFIELD, 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": "425 ST JAMES AV, SPRINGFIELD, 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": -72.56983337486975,
    "latitude": 42.12103035,
    "address": "425 ST JAMES AV, SPRINGFIELD",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "25013-ab8632b48be9f5e8fd60",
        "korzy_id": "25013-ab8632b48be9f5e8fd60",
        "parcelid": "11170-0344",
        "parceladdr": "425 ST JAMES AV",
        "parcelcity": "SPRINGFIELD",
        "situs_zip": "00000",
        "statefp": "25",
        "geoid": "25013",
        "longitude": -72.56983337486975,
        "latitude": 42.12103035,
        "usedesc": "Storage, Warehouses And Distribution",
        "yearbuilt": 1909,
        "bldgsqft": 8436,
        "totalvalue": 552800,
        "saledate": "2007-06-29",
        "saleamt": 180000,
        "updated": "2026-11-03"
      }
    ],
    "truncated": false
  },
  "sections": {
    "utilities": {
      "status": "ok",
      "data": {
        "water": [
          {
            "id": "utility:water:36303",
            "feature_id": "water:36303",
            "name": "SPRINGFIELD WATER AND SEWER COMMISSION",
            "boundary_basis": "System Sourced"
          }
        ],
        "sewer": [
          {
            "id": "utility:sewer:888",
            "feature_id": "sewer:888",
            "name": "Springfield Sewerage Collection System and WPCF",
            "boundary_basis": "Sourced"
          }
        ],
        "treatment_plants": [
          {
            "id": "utility:treatment:2069",
            "feature_id": "treatment:2069",
            "name": "Springfield Sewerage Collection System and WPCF",
            "distance_km": 2.7248936117360527
          },
          {
            "id": "utility:treatment:2075",
            "feature_id": "treatment:2075",
            "name": "Chicopee Sewerage Collection System and WPCF",
            "distance_km": 5.613777451426708
          },
          {
            "id": "utility:treatment:13951",
            "feature_id": "treatment:13951",
            "name": "Holyoke Sewerage Collection System and WPCF",
            "distance_km": 8.545856623428246
          }
        ],
        "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 25013-ab8632b48be9f5e8fd60. 1 credit.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"items":[{"korzy_id":"25013-ab8632b48be9f5e8fd60"}],"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 $KORZY_API_KEY" \
  https://api.korzy.co/v1/records/25013-ab8632b48be9f5e8fd60
JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("25013-ab8632b48be9f5e8fd60")}`, {
  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);

Hampden County data questions

How many parcels in Hampden County include year built?
About 110,000 of about 160,000 parcel records (69%) include year built.
Does the Korzy API return owner names for Hampden County parcels?
Hampden 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 Hampden County?
Korzy tracks 3 data-center projects in Hampden County: 2 proposed and 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 Hampden County?
About 80 operable power plants in Hampden County total about 1,400 MW of nameplate capacity, mainly natural gas, battery and pumped storage and solar.
Which water systems serve Hampden County?
Service areas of about 35 community water systems cover about 27% of Hampden County, and sewer service areas cover about 22%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

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Build on Hampden 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