Polk County, IA parcel and infrastructure data API
Korzy has about 210,000 parcel records for Polk County, Iowa, with source updates through October 2026. 78% include values and 78% include last sale. In and around the county the API also maps about 20 data-center projects (10 operating and 3 under construction); 8 power plants with about 1,100 MW of capacity, led by natural gas; and about 170 miles of active rail. 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 Polk County
About 210,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from October 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 · 98% | |
| Owner name | Some · 1% | |
| Assessed or market value | Most · 78% | |
| Year built | Many · 73% | |
| Building size | Many · 73% | |
| Last sale | Most · 78% | |
| Land use | Most · 78% | |
| 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. 1% of Polk County records carry an owner name.
Infrastructure in and around Polk County
Power plants
8 operable plants with about 1,100 MW of nameplate capacity; largest by capacity: natural gas, battery and pumped storage, other fuels.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 60 in-service substations, 6 rated 230 kV or higher.
About 270 miles of transmission lines: about 55 mi at under 100 kV; about 160 mi at 100–161 kV; about 50 mi at 345 kV.
Water and sewer service
Service areas of about 35 community water systems cover about 76% of the county.
Sewer service areas of 7 systems cover about 13%.
At an address or point: /v1/lookup section utilities
Data-center projects
About 20 tracked projects: 10 operating, 3 under construction, 1 permitted, 1 proposed, 6 status not reported. Reported operating capacity: about 360 MW. Reported planned capacity: about 1,000 MW.
Within 10 km: /v1/lookup section datacenters
Flood zones and wetlands
Special flood hazard areas cover about 17% of the county on the current federal flood maps, published September 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 80 of it main line
- About 75 miles of national freight network highway
Within 25 km: /v1/lookup section logistics
Example requests for Polk 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 3540 SW 61ST STREET, DES MOINES, IA 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":"3540 SW 61ST STREET, DES MOINES, IA","sections":["datacenters"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "3540 SW 61ST STREET, DES MOINES, IA", "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": -93.69993209986907,
"latitude": 41.5503056,
"address": "3540 SW 61ST STREET, DES MOINES",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "19153-29c3ed00e0062115961a",
"korzy_id": "19153-29c3ed00e0062115961a",
"parcelid": "77-782523620007",
"parceladdr": "3540 SW 61ST STREET",
"parcelcity": "DES MOINES",
"situs_zip": "50321",
"statefp": "19",
"geoid": "19153",
"longitude": -93.69993209986907,
"latitude": 41.5503056
}
],
"truncated": false
},
"sections": {
"datacenters": {
"status": "ok",
"data": {
"radius_km": 10,
"projects": [
{
"id": "datacenter:dc_b5d6eadd8dd09e88e5f6",
"project_id": "dc_b5d6eadd8dd09e88e5f6",
"name": "Uniti Des Moines Data Center (formerly Windstream Wholesale)",
"operator": "Uniti",
"status": "operating",
"state": "IA",
"city": "Des Moines",
"address": "3540 SW 61st St",
"longitude": -93.700416,
"latitude": 41.552651,
"location_precision": "exact",
"source_count": 1,
"source_date": "2026-10-11",
"mapped": true,
"distance_km": 0.26388727819514846
},
{
"id": "datacenter:dc_271c23c3457cc974da6e",
"project_id": "dc_271c23c3457cc974da6e",
"name": "Microsoft Project Alluvion Data Center",
"operator": "Microsoft",
"status": "operating",
"state": "IA",
"city": "West Des Moines",
"address": "550 SE White Crane Road",
"longitude": -93.70509523394365,
"latitude": 41.51672205,
"location_precision": "footprint",
"source_count": 3,
"source_date": "2026-09-16",
"mapped": true,
"distance_km": 3.758973858235752
},
{
"id": "datacenter:dc_8f86edbba87c5f079dbb",
"project_id": "dc_8f86edbba87c5f079dbb",
"name": "Microsoft Project Ginger East Data Center",
"operator": "Microsoft",
"status": "under_construction",
"state": "IA",
"city": "West Des Moines",
"address": "1475 SE Maffitt Lake Road",
"longitude": -93.7362003,
"latitude": 41.5193146,
"location_precision": "approximate",
"source_count": 1,
"source_date": "2026-09-16",
"mapped": true,
"distance_km": 4.581307891765856
}
],
"truncated": true,
"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 19153-29c3ed00e0062115961a, 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":"19153-29c3ed00e0062115961a"}],"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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/19153-29c3ed00e0062115961aJavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("19153-29c3ed00e0062115961a")}`, {
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);Polk County data questions
- How many parcels in Polk County include year built?
- About 150,000 of about 210,000 parcel records (73%) include year built.
- Does the Korzy API return owner names for Polk County parcels?
- Yes. 1% of Polk 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 Polk County?
- Korzy tracks about 20 data-center projects in Polk County: 10 operating, 6 status not reported and 3 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 Polk County?
- 8 operable power plants in Polk County total about 1,100 MW of nameplate capacity, mainly natural gas, battery and pumped storage and other fuels.
- Which water systems serve Polk County?
- Service areas of about 35 community water systems cover about 76% of Polk County, and sewer service areas cover about 13%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
More featured counties
- Pottawattamie County, IAabout 54,000 parcels
- Linn County, IAabout 110,000 parcels
Build on Polk 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.