How many parcels in Lake County include year built?

About 220,000 of about 320,000 parcel records (68%) include year built.

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

Yes. 86% of Lake 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 Lake County?

Korzy tracks 3 data-center projects in Lake County: 1 operating, 1 under construction 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 Lake County?

6 operable power plants in Lake County total about 730 MW of nameplate capacity, mainly natural gas, oil and solar.

Which water systems serve Lake County?

Service areas of about 95 community water systems cover about 50% of Lake County, and sewer service areas cover about 53%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

Lake County, IL parcel and infrastructure data API

Korzy has about 320,000 parcel records for Lake County, Illinois, with source updates through November 2026. 86% include owner names and 86% include values. In and around the county the API also maps 3 data-center projects (1 operating and 1 under construction); 6 power plants with about 730 MW of capacity, led by natural gas; and about 170 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 Lake County

About 320,000 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:

Field	Coverage	Share
Situs address	Nearly all · 99%
Owner name	Most · 86%
Assessed or market value	Most · 86%
Year built	Many · 68%
Building size	Many · 67%
Last sale	Many · 71%
Land use	Most · 86%
Zoning	Most · 86%

Owner name and mailing address are returned by /v1/enrich with the owner group, at 2 credits per parcel instead of 1 credit. 86% of Lake County records carry an owner name.

Infrastructure in and around Lake County

Power plants

6 operable plants with about 730 MW of nameplate capacity; largest by capacity: natural gas, oil, solar. Proposed generators add 5 MW.

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

Substations and transmission

About 55 in-service substations, about 10 rated 230 kV or higher.

About 350 miles of transmission lines: about 200 mi at 100–161 kV; about 150 mi at 345 kV.

Water and sewer service

Service areas of about 95 community water systems cover about 50% of the county.

Sewer service areas of about 25 systems cover about 53%.

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

Data-center projects

3 tracked projects: 1 operating, 1 under construction, 1 status not reported. Reported operating capacity: about 15 MW. Reported planned capacity: about 1,200 MW.

Within 10 km: /v1/lookup section datacenters

Flood zones and wetlands

Special flood hazard areas cover about 18% of the county on the current federal flood maps, published October 2026.

Mapped wetlands cover about 8%.

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

Rail, ports and freight

About 170 miles of active rail, about 150 of it main line
About 25 miles of national freight network highway

Within 25 km: /v1/lookup section logistics

Example requests for Lake 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 384 N IVANHOE RD, GRAYSLAKE, IL 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":"384 N IVANHOE RD, GRAYSLAKE, IL","sections":["utilities"]}' \
  https://api.korzy.co/v1/lookup

Python

import os
import requests

response = requests.post(
    "https://api.korzy.co/v1/lookup",
    json={"address": "384 N IVANHOE RD, GRAYSLAKE, IL", "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": -88.02939246761562,
    "latitude": 42.3352764,
    "address": "384 N IVANHOE RD, GRAYSLAKE",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "17097-bea0fb2aeb090844a388",
        "korzy_id": "17097-bea0fb2aeb090844a388",
        "parcelid": "0635200032",
        "parceladdr": "384 N IVANHOE RD",
        "parcelcity": "GRAYSLAKE",
        "situs_zip": "60030",
        "statefp": "17",
        "geoid": "17097",
        "longitude": -88.02939246761562,
        "latitude": 42.3352764,
        "usedesc": "COM-Commercial",
        "land_use_code": "COM",
        "zoning_code": "INC",
        "yearbuilt": 1943,
        "bldgsqft": 6034,
        "taxacres": 1.2397,
        "totalvalue": 232412,
        "land_value_usd": 135717,
        "improvement_value_usd": 116218,
        "assessed_value_usd": 251935,
        "saledate": "2024-08-12",
        "saleamt": 646000,
        "updated": "2026-11-03"
      }
    ],
    "truncated": false
  },
  "sections": {
    "utilities": {
      "status": "ok",
      "data": {
        "water": [
          {
            "id": "utility:water:25548",
            "feature_id": "water:25548",
            "name": "GRAYSLAKE",
            "boundary_basis": "Modeled"
          }
        ],
        "sewer": [
          {
            "id": "utility:sewer:444",
            "feature_id": "sewer:444",
            "name": "NORTH SHORE S.D. - GURNEE STP",
            "boundary_basis": "Sourced"
          }
        ],
        "treatment_plants": [
          {
            "id": "utility:treatment:3629",
            "feature_id": "treatment:3629",
            "name": "NORTH SHORE S.D. - GURNEE STP",
            "distance_km": 8.892310509127347
          },
          {
            "id": "utility:treatment:14776",
            "feature_id": "treatment:14776",
            "name": "Lake County DPW, Mill Creek WWTP",
            "distance_km": 10.480195565094554
          },
          {
            "id": "utility:treatment:3627",
            "feature_id": "treatment:3627",
            "name": "LINDENHURST SANITARY DISTRICT",
            "distance_km": 10.542754470138705
          }
        ],
        "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 17097-bea0fb2aeb090844a388, 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":"17097-bea0fb2aeb090844a388"}],"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/17097-bea0fb2aeb090844a388

JavaScript

const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("17097-bea0fb2aeb090844a388")}`, {
  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);

Lake County data questions

How many parcels in Lake County include year built?: About 220,000 of about 320,000 parcel records (68%) include year built.
Does the Korzy API return owner names for Lake County parcels?: Yes. 86% of Lake 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 Lake County?: Korzy tracks 3 data-center projects in Lake County: 1 operating, 1 under construction 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 Lake County?: 6 operable power plants in Lake County total about 730 MW of nameplate capacity, mainly natural gas, oil and solar.
Which water systems serve Lake County?: Service areas of about 95 community water systems cover about 50% of Lake County, and sewer service areas cover about 53%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

More featured counties

Cook County, ILBorders Lake County · about 1.9 million parcels
DuPage County, ILabout 340,000 parcels

All featured Illinois counties

Build on Lake 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