Westchester County, NY parcel and infrastructure data API

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 /api/parcel-record. Share of records with each field:

Owner name and mailing address are returned with include_owner=true, which doubles a request's cost: a parcel record costs 2 credits instead of 1. 99% of Westchester County records carry an owner name.

Infrastructure in and around Westchester County

Example requests for Westchester 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 29 CHASE RD, Scarsdale, NY 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=29 CHASE RD, Scarsdale, NY' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "29 CHASE RD, Scarsdale, NY"},
    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": "36119-b501245bf051af27be68",
      "address": "29 CHASE RD",
      "city": "Scarsdale",
      "postcode": "10583",
      "county": "Westchester",
      "statefp": "36",
      "longitude": -73.80640040933969,
      "latitude": 40.9899367,
      "match_type": "exact",
      "parcelid": "55500100200500080000000000",
      "parceladdr": "29 CHASE RD",
      "parcelcity": "Scarsdale",
      "situs_zip": "10583",
      "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",
      "geoid": "36119"
    }
  ],
  "truncated": false
}

With include_owner=true (2 credits) the record adds owner fields, shown here as placeholders:

{
  "owner_name": "EXAMPLE HOLDINGS LLC",
  "owner_mailing_address": "100 EXAMPLE ST, SAMPLE CITY, ST 00000"
}

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, 36119-b501245bf051af27be68, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-73.8064' \
  --data-urlencode 'latitude=40.989937' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-73.8064", "latitude": "40.989937", "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=-73.8064' \
  --data-urlencode 'latitude=40.989937' \
  https://api.korzy.co/api/utilities/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/utilities/context",
    params={"longitude": "-73.8064", "latitude": "40.989937"},
    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": -73.8064,
  "latitude": 40.989937,
  "matches": {
    "water": [
      {
        "feature_id": "water:34626",
        "name": "SCARSDALE WATER DEPARTMENT",
        "boundary_basis": "System Sourced"
      }
    ],
    "sewer": [
      {
        "feature_id": "sewer:1559",
        "name": "Westchester (Co) Yonkers Joint STP",
        "boundary_basis": "Sourced"
      }
    ]
  },
  "nearby_treatment": [
    {
      "feature_id": "treatment:12046",
      "name": "Westchester (Co) Mamaroneck SD STP",
      "distance_km": 7.762399940756141
    },
    {
      "feature_id": "treatment:12047",
      "name": "Westchester (Co) New Rochelle STP",
      "distance_km": 9.270555633132611
    }
  ]
}

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. Add include_owner=true to a point, search or parcel-record request; it doubles the request's cost, so a single parcel record costs 2 credits.

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. /api/datacenters/context lists projects within 10 km of any 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%. /api/utilities/context returns the water and sewer matches at a point.

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