DuPage County, IL parcel and infrastructure data API
Korzy has about 340,000 parcel records for DuPage County, Illinois, with source updates through November 2026. Nearly every record carries owner names, values and land use. In and around the county the API also maps about 20 data-center projects (9 operating and 1 under construction); 5 power plants with about 1,100 MW of capacity, led by natural gas; and 2 ports with reported cargo. Look up any parcel by address or coordinates, then check nearby data-center projects, utilities and grid context at the same point.
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 /v1/records/{id}. Share of records with each field:
| Field | Coverage | Share |
|---|---|---|
| Situs address | Nearly all · 99% | |
| Owner name | Nearly all · 99% | |
| Assessed or market value | Nearly all · 99% | |
| Year built | Not published | |
| Building size | Not published | |
| 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 DuPage County records carry an owner name.
Infrastructure in and around DuPage County
Power plants
5 operable plants with about 1,100 MW of nameplate capacity; largest by capacity: natural gas, other fuels, solar. Proposed generators add about 15 MW.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 75 in-service substations, about 20 rated 230 kV or higher.
About 420 miles of transmission lines: 2 mi at under 100 kV; about 200 mi at 100–161 kV; about 200 mi at 345 kV.
Water and sewer service
Service areas of about 55 community water systems cover about 74% of the county.
Sewer service areas of about 30 systems cover about 89%.
At an address or point: /v1/lookup section utilities
Data-center projects
About 20 tracked projects: 9 operating, 1 under construction, 10 status not reported. Reported operating capacity: about 320 MW. Reported planned capacity: about 55 MW.
Within 10 km: /v1/lookup section datacenters
Flood zones and wetlands
Special flood hazard areas cover about 8% 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 170 miles of active rail, about 110 of it main line
- About 55 miles of national freight network highway
- 2 port areas with reported cargo tonnage
Within 25 km: /v1/lookup section logistics
Example requests for DuPage 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 nearby data-center projects
/v1/lookup matches 250 S PARK BLVD, GLEN ELLYN, IL and returns the parcel's korzy_id and record, plus the data-center projects within 10 km, nearest first. 2 credits.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"address":"250 S PARK BLVD, GLEN ELLYN, IL","sections":["datacenters"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "250 S PARK BLVD, GLEN ELLYN, IL", "sections": ["datacenters"]},
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"]["datacenters"]["status"])Production response (trimmed)
{
"location": {
"longitude": -88.06304508696797,
"latitude": 41.85044962840624,
"address": "250 S PARK BLVD, GLEN ELLYN",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "17043-992c973eccb3e511efc0",
"korzy_id": "17043-992c973eccb3e511efc0",
"parcelid": "0523308003",
"parceladdr": "250 S PARK BLVD",
"parcelcity": "GLEN ELLYN",
"situs_zip": "60137",
"statefp": "17",
"geoid": "17043",
"longitude": -88.06304508696797,
"latitude": 41.85044962840624,
"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"
}
],
"truncated": false
},
"sections": {
"datacenters": {
"status": "ok",
"data": {
"radius_km": 10,
"projects": [
{
"id": "datacenter:dc_35bbb1c07638726180a3",
"project_id": "dc_35bbb1c07638726180a3",
"name": "Centersquare Lisle ORD4 Data Center",
"operator": "Centersquare",
"status": "unknown",
"state": "IL",
"city": "Lisle",
"address": "4513 Western Avenue",
"longitude": -88.09488559911235,
"latitude": 41.8023406,
"location_precision": "footprint",
"source_count": 2,
"source_date": "2026-02-09",
"mapped": true,
"distance_km": 5.964689071705734
},
{
"id": "datacenter:dc_c9a31323a5e853ff7de3",
"project_id": "dc_c9a31323a5e853ff7de3",
"name": "Centersquare ORD4 (Lisle)",
"operator": "Centersquare (Csquare)",
"status": "operating",
"state": "IL",
"city": "Lisle",
"address": "4513 Western Avenue",
"longitude": -88.0948856,
"latitude": 41.8023406,
"location_precision": "approximate",
"operational_mw": 88.9,
"source_count": 1,
"source_date": "2026-09-25",
"mapped": true,
"distance_km": 5.964689104238105
},
{
"id": "datacenter:dc_f45aeef5b9bcab734863",
"project_id": "dc_f45aeef5b9bcab734863",
"name": "Karis Critical Naperville Data Center",
"operator": "Karis Critical",
"status": "cancelled",
"state": "IL",
"city": "Naperville",
"longitude": -88.117382,
"latitude": 41.809029,
"location_precision": "approximate",
"planned_mw": 36,
"source_count": 1,
"source_date": "2026-09-25",
"mapped": true,
"distance_km": 6.440634836019389
}
],
"truncated": false,
"note": "Straight-line distance to the reported project point; inspect location_precision. Projects merge supported source matches, not every nearby building. Approximate locations do not identify a parcel. Reported IT load, facility power, planned capacity and estimates remain separate source claims. No record or unknown status does not establish absence or inactivity."
},
"provenance": [
{
"dataset": "datacenters",
"as_of": "2026-11-02",
"data_version": "20261102T123021962884Z"
}
]
}
},
"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 17043-992c973eccb3e511efc0, 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":"17043-992c973eccb3e511efc0"}],"fields":["identity","sale","owner"]}' \
https://api.korzy.co/v1/enrich3. 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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/17043-992c973eccb3e511efc0JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("17043-992c973eccb3e511efc0")}`, {
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);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. 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 DuPage County?
- Korzy tracks about 20 data-center projects in DuPage County: 10 status not reported, 9 operating and 1 under construction. A /v1/lookup with the datacenters section lists projects within 10 km of any address or 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%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
More featured counties
- Cook County, ILBorders DuPage County · about 1.9 million parcels
- Lake County, ILabout 320,000 parcels
Build on DuPage 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.