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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.

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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 /api/parcel-record. Share of records with each field:

FieldCoverageShare
Situs addressMost · 89%
Owner nameNearly all · 98%
Assessed or market valueNearly all · 99%
Year builtNot published
Building sizeNot published
Last saleNearly all · 98%
Land useNearly all · 99%
ZoningNot published

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. 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.

Plant details: /api/power/plants/{plant_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 a point: /api/utilities/context

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 of a point: /api/datacenters/context

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%.

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 of a point: /api/logistics/context

Example requests for Linn 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 3336 PRAIRIE DR NE, CEDAR RAPIDS, IA 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=3336 PRAIRIE DR NE, CEDAR RAPIDS, IA' \
  https://api.korzy.co/api/search
Python
import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "3336 PRAIRIE DR NE, CEDAR RAPIDS, IA"},
    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"])
Response (trimmed)
{
  "results": [
    {
      "korzy_id": "19113-ecfccfe7bfa9afb105c9",
      "address": "3336 PRAIRIE DR NE",
      "city": "CEDAR RAPIDS",
      "postcode": "52402",
      "county": "Linn",
      "statefp": "19",
      "longitude": -91.65223489052262,
      "latitude": 42.0127168,
      "match_type": "exact",
      "parcelid": "141030301500000",
      "parceladdr": "3336 PRAIRIE DR NE",
      "parcelcity": "CEDAR RAPIDS",
      "situs_zip": "52402",
      "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",
      "geoid": "19113"
    }
  ],
  "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, 19113-ecfccfe7bfa9afb105c9, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-91.652235' \
  --data-urlencode 'latitude=42.012717' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point
JavaScript
const params = new URLSearchParams({"longitude": "-91.652235", "latitude": "42.012717", "limit": "5"});
const response = await fetch(`https://api.korzy.co/api/query/point?${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=-91.652235' \
  --data-urlencode 'latitude=42.012717' \
  --data-urlencode 'radius_km=10' \
  --data-urlencode 'limit=3' \
  https://api.korzy.co/api/datacenters/context
Python
import os
import requests

response = requests.get(
    "https://api.korzy.co/api/datacenters/context",
    params={"longitude": "-91.652235", "latitude": "42.012717", "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"])
Response (trimmed)
{
  "projects": [
    {
      "project_id": "dc_9b6bebdb6d1bf25e19d8",
      "name": "Enseva Hiawatha Data Center",
      "operator": "Enseva",
      "status": "operating",
      "city": "Hiawatha",
      "state": "IA",
      "longitude": -91.6795571,
      "latitude": 42.0562849,
      "location_precision": "exact",
      "distance_km": 5.34428408480123
    },
    {
      "project_id": "dc_ed95a8385a0b0cdb33c3",
      "name": "Ark Data Centers Marion (Cedar Rapids)",
      "operator": "Ark Data Centers (formerly Involta)",
      "status": "operating",
      "city": "Marion",
      "state": "IA",
      "longitude": -91.5871,
      "latitude": 42.0341,
      "location_precision": "approximate",
      "operational_mw": 0.81,
      "distance_km": 5.88234298347906
    },
    {
      "project_id": "dc_74371f7fbcc2efe7da3f",
      "name": "Oppidan Cedar Rapids Data Center",
      "operator": "Oppidan",
      "status": "permitted",
      "city": "Cedar Rapids",
      "state": "IA",
      "longitude": -91.6736877,
      "latitude": 41.9439273,
      "location_precision": "approximate",
      "planned_mw": 10,
      "distance_km": 7.85194594023269
    }
  ],
  "radius_km": 10,
  "limit": 3,
  "truncated": false
}

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. 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 Linn County?
Korzy tracks 7 data-center projects in Linn County: 3 under construction, 2 operating and 1 permitted. /api/datacenters/context lists projects within 10 km of any 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%. /api/utilities/context returns the water and sewer matches at a point.

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Build on Linn County parcel data

Search, point and record lookups work the same in every county Korzy covers. Credits are shared across parcels, utilities, environment, logistics and data-center routes.

Get an API keySee pricingAPI referenceUse cases for parcel and infrastructure data