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. 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 Suffolk County?

Korzy tracks 4 data-center projects in Suffolk 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 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%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

Suffolk County, NY parcel and infrastructure data API

Korzy has about 590,000 parcel records for Suffolk County, New York, with source updates through January 2025. Nearly every record carries owner names, values and land use. In and around the county the API also maps about 55 power plants with about 4,300 MW of capacity, led by natural gas; 4 data-center projects (2 operating); and 1 port with reported cargo. 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 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 /v1/records/{id}. Share of records with each field:

Field	Coverage	Share
Situs address	Nearly all · 100%
Owner name	Nearly all · 99%
Assessed or market value	Nearly all · 99%
Year built	Some · 14%
Building size	Some · 14%
Last sale	Not published
Land use	Nearly all · 99%
Zoning	Not 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 Suffolk County records carry an owner name.

Infrastructure in and around Suffolk County

Power plants

About 55 operable plants with about 4,300 MW of nameplate capacity; largest by capacity: natural gas, oil, battery and pumped storage. Proposed generators add about 200 MW.

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

Substations and transmission

About 130 in-service substations.

About 680 miles of transmission lines: about 430 mi at under 100 kV; about 220 mi at 100–161 kV.

Water and sewer service

Service areas of about 25 community water systems cover about 65% of the county.

Sewer service areas of about 40 systems cover about 10%.

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

Data-center projects

4 tracked projects: 2 operating, 1 proposed, 1 status not reported. Reported operating capacity: about 10 MW. Reported planned capacity: about 190 MW.

Within 10 km: /v1/lookup section datacenters

Flood zones and wetlands

Special flood hazard areas cover about 13% of the county on the current federal flood maps, published October 2026.

Mapped wetlands cover about 4%.

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

Rail, ports and freight

About 200 miles of active rail, about 180 of it main line
About 40 miles of national freight network highway
1 port area with reported cargo tonnage

Within 25 km: /v1/lookup section logistics

Example requests for Suffolk 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 258 270 Lake Ave, Smithtown, 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":"258 270 Lake Ave, Smithtown, 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": "258 270 Lake Ave, Smithtown, 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": -73.15693898657268,
    "latitude": 40.87699745,
    "address": "258 270 Lake Ave, Smithtown",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "36103-b2c84050cd958035406e",
        "korzy_id": "36103-b2c84050cd958035406e",
        "parcelid": "47348905500000010530000000",
        "parceladdr": "258 270 Lake Ave",
        "parcelcity": "Smithtown",
        "situs_zip": "11787",
        "statefp": "36",
        "geoid": "36103",
        "longitude": -73.15693898657268,
        "latitude": 40.87699745,
        "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"
      }
    ],
    "truncated": false
  },
  "sections": {
    "utilities": {
      "status": "ok",
      "data": {
        "water": [
          {
            "id": "utility:water:34692",
            "feature_id": "water:34692",
            "name": "ST JAMES WATER DISTRICT",
            "boundary_basis": "System Sourced"
          }
        ],
        "treatment_plants": [
          {
            "id": "utility:treatment:11920",
            "feature_id": "treatment:11920",
            "name": "Suffolk (Co) SCSD #28 Fairfield",
            "distance_km": 1.5083813875305647
          },
          {
            "id": "utility:treatment:15444",
            "feature_id": "treatment:15444",
            "name": "Suffolk (Co) SCSD #4 Galleria",
            "distance_km": 3.312939900086991
          },
          {
            "id": "utility:treatment:11919",
            "feature_id": "treatment:11919",
            "name": "Suffolk (Co) SCSD #15 NOB HILL",
            "distance_km": 5.701844877971282
          }
        ],
        "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 36103-b2c84050cd958035406e, 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":"36103-b2c84050cd958035406e"}],"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/36103-b2c84050cd958035406e

JavaScript

const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("36103-b2c84050cd958035406e")}`, {
  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);

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. 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 Suffolk County?: Korzy tracks 4 data-center projects in Suffolk 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 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%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

More featured counties

Erie County, NYabout 360,000 parcels
Niagara County, NYabout 86,000 parcels
New York County, NYabout 180,000 parcels
Rockland County, NYabout 93,000 parcels
Westchester County, NYabout 250,000 parcels

All featured New York counties

Build on Suffolk 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 key See pricing API reference Use cases for parcel and infrastructure data