Suffolk County, NY parcel and infrastructure data API

Parcel coverage in Suffolk County

About 590,000 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 Suffolk County records carry an owner name.

Infrastructure in and around Suffolk County

Example requests for Suffolk 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 258 270 Lake Ave, Smithtown, 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=258 270 Lake Ave, Smithtown, NY' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "258 270 Lake Ave, Smithtown, 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": "36103-b2c84050cd958035406e",
      "address": "258 270 Lake Ave",
      "city": "Smithtown",
      "postcode": "11787",
      "county": "Suffolk",
      "statefp": "36",
      "longitude": -73.15693898657268,
      "latitude": 40.87699745,
      "match_type": "exact",
      "parcelid": "47348905500000010530000000",
      "parceladdr": "258 270 Lake Ave",
      "parcelcity": "Smithtown",
      "situs_zip": "11787",
      "usedesc": "Row retail",
      "land_use_code": "452",
      "yearbuilt": 1971,
      "bldgsqft": 8800,
      "taxacres": 0.57,
      "totalvalue": 660,
      "land_value_usd": 660,
      "assessed_value_usd": 17610,
      "market_value_usd": 2201250,
      "updated": "2025-01-01",
      "geoid": "36103"
    }
  ],
  "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, 36103-b2c84050cd958035406e, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-73.156939' \
  --data-urlencode 'latitude=40.876997' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-73.156939", "latitude": "40.876997", "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=-73.156939' \
  --data-urlencode 'latitude=40.876997' \
  https://api.korzy.co/api/utilities/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/utilities/context",
    params={"longitude": "-73.156939", "latitude": "40.876997"},
    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": -73.156939,
  "latitude": 40.876997,
  "matches": {
    "water": [
      {
        "feature_id": "water:34692",
        "name": "ST JAMES WATER DISTRICT",
        "boundary_basis": "System Sourced"
      }
    ],
    "sewer": []
  },
  "nearby_treatment": [
    {
      "feature_id": "treatment:11920",
      "name": "Suffolk (Co) SCSD #28 Fairfield",
      "distance_km": 1.5083816401517576
    },
    {
      "feature_id": "treatment:15444",
      "name": "Suffolk (Co) SCSD #4 Galleria",
      "distance_km": 3.3128919848749536
    }
  ]
}

Suffolk County data questions

How many parcels in Suffolk County include year built?

About 83,000 of about 590,000 parcel records (14%) include year built.

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

Yes. 99% of Suffolk 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 Suffolk County?

Korzy tracks 4 data-center projects in Suffolk 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 Suffolk County?

About 55 operable power plants in Suffolk County total about 4,300 MW of nameplate capacity, mainly natural gas, oil and battery and pumped storage.

Which water systems serve Suffolk County?

Service areas of about 25 community water systems cover about 65% of Suffolk County, and sewer service areas cover about 10%. /api/utilities/context returns the water and sewer matches at a point.

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