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Westchester County, NY parcel and infrastructure data API

Korzy has about 250,000 parcel records for Westchester County, New York, with source updates through January 2025. Nearly every record carries owner names, values and land use; 48% include building size and 46% include year built. In and around the county the API also maps 4 data-center projects (2 operating); 1 port with reported cargo; and about 25 power plants with about 160 MW of capacity, led by oil. 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 Westchester County

About 250,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from January 2025. 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 · 100%
Owner nameNearly all · 99%
Assessed or market valueNearly all · 99%
Year builtMany · 46%
Building sizeMany · 48%
Last saleNot published
Land useNearly all · 99%
ZoningNot published

Owner name and mailing address are returned by /v1/enrich with the owner group, at 2 credits per parcel instead of 1 credit. 99% of Westchester County records carry an owner name.

Infrastructure in and around Westchester County

Power plants

About 25 operable plants with about 160 MW of nameplate capacity; largest by capacity: oil, other fuels, solar.

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

Substations and transmission

About 15 in-service substations, 6 rated 230 kV or higher.

About 280 miles of transmission lines: about 45 mi at 100–161 kV; about 220 mi at 345 kV.

Water and sewer service

Service areas of about 85 community water systems cover about 51% of the county.

Sewer service areas of about 20 systems cover about 42%.

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

Data-center projects

4 tracked projects: 2 operating, 1 proposed, 1 status not reported. Reported planned capacity: about 200 MW.

Within 10 km: /v1/lookup section datacenters

Grid capacity data

11 utility-published grid capacity layers cover parts of Westchester County, including load headroom, capacity bands, substation and feeder ratings, substation inventory.

Nearby records: /v1/lookup section grid

Flood zones and wetlands

Special flood hazard areas cover about 14% of the county on the current federal flood maps, published October 2026.

Mapped wetlands cover about 3%.

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

Rail, ports and freight

  • About 90 miles of active rail, about 80 of it main line
  • About 60 miles of national freight network highway
  • 1 port area with reported cargo tonnage

Within 25 km: /v1/lookup section logistics

Example requests for Westchester 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 29 CHASE RD, Scarsdale, NY 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":"29 CHASE RD, Scarsdale, NY","sections":["utilities"]}' \
  https://api.korzy.co/v1/lookup
Python
import os
import requests

response = requests.post(
    "https://api.korzy.co/v1/lookup",
    json={"address": "29 CHASE RD, Scarsdale, NY", "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": -73.80640040933969,
    "latitude": 40.9899367,
    "address": "29 CHASE RD, Scarsdale",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "36119-b501245bf051af27be68",
        "korzy_id": "36119-b501245bf051af27be68",
        "parcelid": "55500100200500080000000000",
        "parceladdr": "29 CHASE RD",
        "parcelcity": "Scarsdale",
        "situs_zip": "10583",
        "statefp": "36",
        "geoid": "36119",
        "longitude": -73.80640040933969,
        "latitude": 40.9899367,
        "usedesc": "Post office",
        "land_use_code": "650",
        "yearbuilt": 1992,
        "bldgsqft": 8990,
        "taxacres": 0.41,
        "totalvalue": 2160000,
        "land_value_usd": 2160000,
        "assessed_value_usd": 5400000,
        "market_value_usd": 2400000,
        "updated": "2025-01-01"
      }
    ],
    "truncated": false
  },
  "sections": {
    "utilities": {
      "status": "ok",
      "data": {
        "water": [
          {
            "id": "utility:water:34626",
            "feature_id": "water:34626",
            "name": "SCARSDALE WATER DEPARTMENT",
            "boundary_basis": "System Sourced"
          }
        ],
        "sewer": [
          {
            "id": "utility:sewer:1559",
            "feature_id": "sewer:1559",
            "name": "Westchester (Co) Yonkers Joint STP",
            "boundary_basis": "Sourced"
          }
        ],
        "treatment_plants": [
          {
            "id": "utility:treatment:12046",
            "feature_id": "treatment:12046",
            "name": "Westchester (Co) Mamaroneck SD STP",
            "distance_km": 7.762406367257915
          },
          {
            "id": "utility:treatment:12047",
            "feature_id": "treatment:12047",
            "name": "Westchester (Co) New Rochelle STP",
            "distance_km": 9.27053725898749
          },
          {
            "id": "utility:treatment:12045",
            "feature_id": "treatment:12045",
            "name": "Westchester (Co) Blind Brook SD STP",
            "distance_km": 9.916885067916663
          }
        ],
        "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 owner and sale fields

/v1/enrich returns the fields you choose for up to 25 parcels per request; here the parcel 36119-b501245bf051af27be68, with the owner group. 2 credits.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"items":[{"korzy_id":"36119-b501245bf051af27be68"}],"fields":["identity","sale","owner"]}' \
  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 $KORZY_API_KEY" \
  https://api.korzy.co/v1/records/36119-b501245bf051af27be68
JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("36119-b501245bf051af27be68")}`, {
  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);

Westchester County data questions

How many parcels in Westchester County include year built?
About 120,000 of about 250,000 parcel records (46%) include year built.
Does the Korzy API return owner names for Westchester County parcels?
Yes. 99% of Westchester County parcel records carry an owner name. Ask /v1/enrich for the owner group; each parcel then costs 2 credits instead of 1 credit. Lookups and records never include owner fields.
How many data-center projects are in Westchester County?
Korzy tracks 4 data-center projects in Westchester County: 2 operating, 1 proposed and 1 status not reported. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
How much power generation is in Westchester County?
About 25 operable power plants in Westchester County total about 160 MW of nameplate capacity, mainly oil, other fuels and solar.
Which water systems serve Westchester County?
Service areas of about 85 community water systems cover about 51% of Westchester County, and sewer service areas cover about 42%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

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Build on Westchester 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.

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