Franklin County, OH parcel and infrastructure data API

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

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. 9% of Franklin County records carry an owner name.

Infrastructure in and around Franklin County

Example requests for Franklin 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 296 HARTMAN POND DR 205, OH 43207 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=296 HARTMAN POND DR 205, OH 43207' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "296 HARTMAN POND DR 205, OH 43207"},
    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"])

{
  "results": [
    {
      "korzy_id": "39049-4815b86734a3a1d801c3",
      "address": "296 HARTMAN POND DR 205",
      "postcode": "43207",
      "county": "Franklin",
      "statefp": "39",
      "longitude": -82.99649211585884,
      "latitude": 39.864488936830575,
      "match_type": "exact",
      "parcelid": "510-327701",
      "parceladdr": "296 HARTMAN POND DR 205",
      "situs_zip": "43207",
      "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",
      "geoid": "39049"
    }
  ],
  "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, 39049-4815b86734a3a1d801c3, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-82.996492' \
  --data-urlencode 'latitude=39.864489' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-82.996492", "latitude": "39.864489", "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=-82.996492' \
  --data-urlencode 'latitude=39.864489' \
  --data-urlencode 'radius_km=10' \
  --data-urlencode 'limit=3' \
  https://api.korzy.co/api/datacenters/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/datacenters/context",
    params={"longitude": "-82.996492", "latitude": "39.864489", "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"])

{
  "projects": [
    {
      "project_id": "dc_afe17b9ebd007a3d2d9a",
      "name": "Google Columbus",
      "operator": "Google",
      "status": "operating",
      "city": "Columbus",
      "state": "OH",
      "longitude": -82.9966065,
      "latitude": 39.849132999999995,
      "location_precision": "footprint",
      "operational_mw": 303,
      "planned_mw": 464,
      "distance_km": 1.7075396231725812
    }
  ],
  "radius_km": 10,
  "limit": 3,
  "truncated": false
}

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. 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 Franklin County?

Korzy tracks about 40 data-center projects in Franklin County: 25 status not reported, 15 operating and 1 under construction. /api/datacenters/context lists projects within 10 km of any 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%. /api/utilities/context returns the water and sewer matches at a point.

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