Franklin County, OH parcel and infrastructure data API
Korzy has about 500,000 parcel records for Franklin County, Ohio, with source updates through November 2026. Nearly every record carries values, last sale and land use; 85% include year built and 84% include building size. In and around the county the API also maps about 40 data-center projects (15 operating and 1 under construction); about 240 miles of active rail; and 6 power plants with about 15 MW of capacity, led by oil. 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 Franklin County
About 500,000 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 | Some · 9% | |
| Assessed or market value | Nearly all · 99% | |
| Year built | Most · 85% | |
| Building size | Most · 84% | |
| Last sale | Nearly all · 99% | |
| 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. 9% of Franklin County records carry an owner name.
Infrastructure in and around Franklin County
Power plants
6 operable plants with about 15 MW of nameplate capacity; largest by capacity: oil, natural gas, solar. Proposed generators add about 200 MW.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 95 in-service substations, 5 rated 230 kV or higher.
About 510 miles of transmission lines: about 45 mi at under 100 kV; about 300 mi at 100–161 kV; about 120 mi at 345 kV.
Water and sewer service
Service areas of about 40 community water systems cover about 82% of the county.
Sewer service areas of about 10 systems cover about 78%.
At an address or point: /v1/lookup section utilities
Data-center projects
About 40 tracked projects: 15 operating, 1 under construction, 25 status not reported. Reported operating capacity: about 740 MW. Reported planned capacity: about 460 MW.
Within 10 km: /v1/lookup section datacenters
Grid capacity data
2 utility-published grid capacity layers cover parts of Franklin County, including load headroom.
Nearby records: /v1/lookup section grid
Flood zones and wetlands
Special flood hazard areas cover about 10% of the county on the current federal flood maps, published October 2026.
Mapped wetlands cover about 1%.
At an address or point: /v1/lookup section environment
Rail, ports and freight
- About 240 miles of active rail, about 160 of it main line
- About 120 miles of national freight network highway
- 1 intermodal rail terminal
Within 25 km: /v1/lookup section logistics
Example requests for Franklin 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 296 HARTMAN POND DR 206, OH 43207 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":"296 HARTMAN POND DR 206, OH 43207","sections":["datacenters"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "296 HARTMAN POND DR 206, OH 43207", "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": -82.99649211585884,
"latitude": 39.864488936830575,
"address": "296 HARTMAN POND DR 206",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "39049-72692b76976c1b610d86",
"korzy_id": "39049-72692b76976c1b610d86",
"parcelid": "510-327704",
"parceladdr": "296 HARTMAN POND DR 206",
"situs_zip": "43207",
"statefp": "39",
"geoid": "39049",
"longitude": -82.99649211585884,
"latitude": 39.864488936830575,
"usedesc": "EXEMPT PROP OWN/ACQUIRE BY MET AUTH",
"land_use_code": "645",
"yearbuilt": 2023,
"bldgsqft": 1015,
"taxacres": 0.23584909,
"totalvalue": 148200,
"land_value_usd": 25000,
"improvement_value_usd": 123200,
"saledate": "2025-01-16",
"saleamt": 0,
"updated": "2026-11-03"
}
],
"truncated": true
},
"sections": {
"datacenters": {
"status": "ok",
"data": {
"radius_km": 10,
"projects": [
{
"id": "datacenter:dc_afe17b9ebd007a3d2d9a",
"project_id": "dc_afe17b9ebd007a3d2d9a",
"name": "Google Columbus",
"operator": "Google",
"status": "operating",
"state": "OH",
"city": "Columbus",
"address": "5076 S High St, Columbus, OH 43207",
"longitude": -82.9966065,
"latitude": 39.849132999999995,
"location_precision": "footprint",
"operational_mw": 303,
"planned_mw": 464,
"it_mw": 303,
"source_count": 3,
"source_date": "2026-08-05",
"mapped": true,
"distance_km": 1.7075325425813155
}
],
"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 39049-72692b76976c1b610d86, 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":"39049-72692b76976c1b610d86"}],"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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/39049-72692b76976c1b610d86JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("39049-72692b76976c1b610d86")}`, {
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);Franklin County data questions
- How many parcels in Franklin County include year built?
- About 430,000 of about 500,000 parcel records (85%) include year built.
- Does the Korzy API return owner names for Franklin County parcels?
- Yes. 9% of Franklin 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 Franklin County?
- Korzy tracks about 40 data-center projects in Franklin County: 25 status not reported, 15 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 Franklin County?
- 6 operable power plants in Franklin County total about 15 MW of nameplate capacity, mainly oil, natural gas and solar.
- Which water systems serve Franklin County?
- Service areas of about 40 community water systems cover about 82% of Franklin County, and sewer service areas cover about 78%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
More featured counties
- Cuyahoga County, OHabout 520,000 parcels
- Butler County, OHabout 170,000 parcels
- Hamilton County, OHabout 420,000 parcels
Build on Franklin 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.