Linn County, IA parcel and infrastructure data API
Korzy has about 110,000 parcel records for Linn County, Iowa, with source updates through November 2026. Nearly every record carries owner names, values, last sale and land use. In and around the county the API also maps 7 data-center projects (2 operating and 3 under construction); about 10 power plants with about 740 MW of capacity, led by coal; and about 150 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 Linn County
About 110,000 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 | Most · 89% | |
| Owner name | Nearly all · 98% | |
| Assessed or market value | Nearly all · 99% | |
| Year built | Not published | |
| Building size | Not published | |
| Last sale | Nearly all · 98% | |
| 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. 98% of Linn County records carry an owner name.
Infrastructure in and around Linn County
Power plants
About 10 operable plants with about 740 MW of nameplate capacity; largest by capacity: coal, solar, natural gas. Proposed generators add about 100 MW.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 70 in-service substations, 1 rated 230 kV or higher.
About 280 miles of transmission lines: about 40 mi at under 100 kV; about 190 mi at 100–161 kV; about 35 mi at 345 kV.
Water and sewer service
Service areas of about 35 community water systems cover about 20% of the county.
Sewer service areas of about 15 systems cover about 15%.
At an address or point: /v1/lookup section utilities
Data-center projects
7 tracked projects: 2 operating, 3 under construction, 1 permitted, 1 proposed. Reported planned capacity: about 3,000 MW.
Within 10 km: /v1/lookup section datacenters
Flood zones and wetlands
Special flood hazard areas cover about 10% of the county on the current federal flood maps, published September 2026.
Mapped wetlands cover about 3%.
At an address or point: /v1/lookup section environment
Rail, ports and freight
- About 150 miles of active rail, about 90 of it main line
- About 30 miles of national freight network highway
Within 25 km: /v1/lookup section logistics
Example requests for Linn 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 3336 PRAIRIE DR NE, CEDAR RAPIDS, 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":"3336 PRAIRIE DR NE, CEDAR RAPIDS, IA","sections":["datacenters"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "3336 PRAIRIE DR NE, CEDAR RAPIDS, 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": -91.65223489052262,
"latitude": 42.0127168,
"address": "3336 PRAIRIE DR NE, CEDAR RAPIDS",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "19113-ecfccfe7bfa9afb105c9",
"korzy_id": "19113-ecfccfe7bfa9afb105c9",
"parcelid": "141030301500000",
"parceladdr": "3336 PRAIRIE DR NE",
"parcelcity": "CEDAR RAPIDS",
"situs_zip": "52402",
"statefp": "19",
"geoid": "19113",
"longitude": -91.65223489052262,
"latitude": 42.0127168,
"usedesc": "COMMERCIAL",
"taxacres": 0.51,
"totalvalue": 237300,
"land_value_usd": 44800,
"improvement_value_usd": 192500,
"assessed_value_usd": 237300,
"saledate": "2019-10-18",
"updated": "2026-11-03"
}
],
"truncated": false
},
"sections": {
"datacenters": {
"status": "ok",
"data": {
"radius_km": 10,
"projects": [
{
"id": "datacenter:dc_9b6bebdb6d1bf25e19d8",
"project_id": "dc_9b6bebdb6d1bf25e19d8",
"name": "Enseva Hiawatha Data Center",
"operator": "Enseva",
"status": "operating",
"state": "IA",
"city": "Hiawatha",
"address": "755 Metzger Drive",
"longitude": -91.6795571,
"latitude": 42.0562849,
"location_precision": "exact",
"source_count": 1,
"source_date": "2026-09-16",
"mapped": true,
"distance_km": 5.34430806337572
},
{
"id": "datacenter:dc_ed95a8385a0b0cdb33c3",
"project_id": "dc_ed95a8385a0b0cdb33c3",
"name": "Ark Data Centers Marion (Cedar Rapids)",
"operator": "Ark Data Centers (formerly Involta)",
"status": "operating",
"state": "IA",
"city": "Marion",
"longitude": -91.5871,
"latitude": 42.0341,
"location_precision": "approximate",
"operational_mw": 0.81,
"source_count": 1,
"source_date": "2026-08-08",
"mapped": true,
"distance_km": 5.8823437088843615
},
{
"id": "datacenter:dc_74371f7fbcc2efe7da3f",
"project_id": "dc_74371f7fbcc2efe7da3f",
"name": "Oppidan Cedar Rapids Data Center",
"operator": "Oppidan",
"status": "permitted",
"state": "IA",
"city": "Cedar Rapids",
"address": "1515 33rd Avenue SW",
"longitude": -91.6736877,
"latitude": 41.9439273,
"location_precision": "approximate",
"planned_mw": 10,
"source_count": 1,
"source_date": "2026-09-16",
"mapped": true,
"distance_km": 7.851926320265029
}
],
"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 19113-ecfccfe7bfa9afb105c9, 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":"19113-ecfccfe7bfa9afb105c9"}],"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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/19113-ecfccfe7bfa9afb105c9JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("19113-ecfccfe7bfa9afb105c9")}`, {
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);Linn County data questions
- How many parcels in Linn County include last sale?
- About 110,000 of about 110,000 parcel records (98%) include last sale.
- Does the Korzy API return owner names for Linn County parcels?
- Yes. 98% of Linn 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 Linn County?
- Korzy tracks 7 data-center projects in Linn County: 3 under construction, 2 operating and 1 permitted. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
- How much power generation is in Linn County?
- About 10 operable power plants in Linn County total about 740 MW of nameplate capacity, mainly coal, solar and natural gas.
- Which water systems serve Linn County?
- Service areas of about 35 community water systems cover about 20% of Linn County, and sewer service areas cover about 15%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
More featured counties
- Polk County, IAabout 210,000 parcels
- Pottawattamie County, IAabout 54,000 parcels
Build on Linn 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.