DuPage County, IL parcel and infrastructure data API

Parcel coverage in DuPage County

About 340,000 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 /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 DuPage County records carry an owner name.

Infrastructure in and around DuPage County

Example requests for DuPage 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 250 S PARK BLVD, GLEN ELLYN, IL 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=250 S PARK BLVD, GLEN ELLYN, IL' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "250 S PARK BLVD, GLEN ELLYN, IL"},
    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": "17043-992c973eccb3e511efc0",
      "address": "250 S PARK BLVD",
      "city": "GLEN ELLYN",
      "postcode": "60137",
      "county": "DuPage",
      "statefp": "17",
      "longitude": -88.06304508696797,
      "latitude": 41.85044962840624,
      "match_type": "exact",
      "parcelid": "0523308003",
      "parceladdr": "250 S PARK BLVD",
      "parcelcity": "GLEN ELLYN",
      "situs_zip": "60137",
      "usedesc": "SCHOOL",
      "land_use_code": "E",
      "taxacres": 11.99,
      "totalvalue": 0,
      "land_value_usd": 0,
      "improvement_value_usd": 0,
      "market_value_usd": 0,
      "updated": "2026-11-03",
      "geoid": "17043"
    }
  ],
  "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, 17043-992c973eccb3e511efc0, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-88.063045' \
  --data-urlencode 'latitude=41.85045' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-88.063045", "latitude": "41.85045", "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 nearby data-center projects

/api/datacenters/context lists data-center projects within 10 km of the point, nearest first. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-88.063045' \
  --data-urlencode 'latitude=41.85045' \
  --data-urlencode 'radius_km=10' \
  --data-urlencode 'limit=3' \
  https://api.korzy.co/api/datacenters/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/datacenters/context",
    params={"longitude": "-88.063045", "latitude": "41.85045", "radius_km": "10", "limit": "3"},
    headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
    timeout=30,
)
response.raise_for_status()
for project in response.json()["projects"]:
    print(project["name"], project["status"], project["distance_km"])

{
  "projects": [
    {
      "project_id": "dc_35bbb1c07638726180a3",
      "name": "Centersquare Lisle ORD4 Data Center",
      "operator": "Centersquare",
      "status": "unknown",
      "city": "Lisle",
      "state": "IL",
      "longitude": -88.09488559911235,
      "latitude": 41.8023406,
      "location_precision": "footprint",
      "distance_km": 5.96472931338526
    },
    {
      "project_id": "dc_c9a31323a5e853ff7de3",
      "name": "Centersquare ORD4 (Lisle)",
      "operator": "Centersquare (Csquare)",
      "status": "operating",
      "city": "Lisle",
      "state": "IL",
      "longitude": -88.0948856,
      "latitude": 41.8023406,
      "location_precision": "approximate",
      "operational_mw": 88.9,
      "distance_km": 5.964729345917501
    },
    {
      "project_id": "dc_f45aeef5b9bcab734863",
      "name": "Karis Critical Naperville Data Center",
      "operator": "Karis Critical",
      "status": "cancelled",
      "city": "Naperville",
      "state": "IL",
      "longitude": -88.117382,
      "latitude": 41.809029,
      "location_precision": "approximate",
      "planned_mw": 36,
      "distance_km": 6.440669411759181
    }
  ],
  "radius_km": 10,
  "limit": 3,
  "truncated": true
}

DuPage County data questions

How many parcels in DuPage County include values?

About 340,000 of about 340,000 parcel records (99%) include values.

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

Yes. 99% of DuPage 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 DuPage County?

Korzy tracks about 20 data-center projects in DuPage County: 10 status not reported, 9 operating and 1 under construction. /api/datacenters/context lists projects within 10 km of any point.

How much power generation is in DuPage County?

5 operable power plants in DuPage County total about 1,100 MW of nameplate capacity, mainly natural gas, other fuels and solar.

Which water systems serve DuPage County?

Service areas of about 55 community water systems cover about 74% of DuPage County, and sewer service areas cover about 89%. /api/utilities/context returns the water and sewer matches at a point.

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