Hamilton County, OH parcel and infrastructure data API
Korzy has about 420,000 parcel records for Hamilton County, Ohio, with source updates through August 2026. 84% include values and 78% include last sale. In and around the county the API also maps 4 data-center projects (3 operating); 4 power plants with about 1,200 MW of capacity, led by coal; and 2 ports with reported cargo. Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.
Parcel coverage in Hamilton County
About 420,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from August 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 · 76% | |
| Owner name | Not published | |
| Assessed or market value | Most · 84% | |
| Year built | Not published | |
| Building size | Not published | |
| Last sale | Most · 78% | |
| Land use | Not published | |
| Zoning | Not published |
Hamilton County records do not include owner names. See pricing for credit costs.
Infrastructure in and around Hamilton County
Power plants
4 operable plants with about 1,200 MW of nameplate capacity; largest by capacity: coal, oil, natural gas.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 80 in-service substations, 4 rated 230 kV or higher.
About 400 miles of transmission lines: about 40 mi at under 100 kV; about 210 mi at 100–161 kV; about 90 mi at 345 kV.
Water and sewer service
Service areas of about 20 community water systems cover about 97% of the county.
Sewer service areas of about 20 systems cover about 89%.
At an address or point: /v1/lookup section utilities
Data-center projects
4 tracked projects: 3 operating, 1 status not reported. Reported operating capacity: about 15 MW.
Within 10 km: /v1/lookup section datacenters
Flood zones and wetlands
Special flood hazard areas cover about 11% 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 250 miles of active rail, about 140 of it main line
- About 120 miles of national freight network highway
- 2 port areas with reported cargo tonnage
- 3 intermodal rail terminals
Within 25 km: /v1/lookup section logistics
Example requests for Hamilton 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 its water and sewer service
/v1/lookup matches 360 GEST ST, OH 45203 and returns the parcel's korzy_id and record, plus the water and sewer service areas at the parcel and the nearest treatment plants. 2 credits.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"address":"360 GEST ST, OH 45203","sections":["utilities"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "360 GEST ST, OH 45203", "sections": ["utilities"]},
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"]["utilities"]["status"])Production response (trimmed)
{
"location": {
"longitude": -84.52439208982368,
"latitude": 39.097879899999995,
"address": "360 GEST ST",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "39061-63cdbb30914ac04d52d7",
"korzy_id": "39061-63cdbb30914ac04d52d7",
"parcelid": "014700070360",
"parceladdr": "360 GEST ST",
"situs_zip": "45203",
"statefp": "39",
"geoid": "39061",
"longitude": -84.52439208982368,
"latitude": 39.097879899999995,
"taxacres": 4.43,
"totalvalue": 4561690,
"saleamt": 0
}
],
"truncated": false
},
"sections": {
"utilities": {
"status": "ok",
"data": {
"water": [
{
"id": "utility:water:36133",
"feature_id": "water:36133",
"name": "CINCINNATI PUBLIC WATER SYSTEM",
"boundary_basis": "System Sourced"
}
],
"sewer": [
{
"id": "utility:sewer:2214",
"feature_id": "sewer:2214",
"name": "MSD Mill Creek Drainage Basin",
"boundary_basis": "Sourced"
}
],
"treatment_plants": [
{
"id": "utility:treatment:1385",
"feature_id": "treatment:1385",
"name": "MSD Mill Creek Drainage Basin",
"distance_km": 2.363710858731533
},
{
"id": "utility:treatment:1384",
"feature_id": "treatment:1384",
"name": "MSD Little Miami Drainage Basin",
"distance_km": 8.002126085621077
},
{
"id": "utility:treatment:6307",
"feature_id": "treatment:6307",
"name": "N KY SD1 - DRY CREEK STP",
"distance_km": 9.18870883453102
}
],
"truncated": {
"water": false,
"sewer": false
}
},
"provenance": [
{
"dataset": "water",
"data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
},
{
"dataset": "sewer",
"data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
},
{
"dataset": "treatment",
"data_version": "63b7c1c3-9661-4fed-a59f-ddbfff80c2e4"
}
]
}
},
"credits": {
"charged": 2,
"refunded": 0
}
}2. Add value and sale fields
/v1/enrich returns the fields you choose for up to 25 parcels per request; here the parcel 39061-63cdbb30914ac04d52d7. 1 credit.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"items":[{"korzy_id":"39061-63cdbb30914ac04d52d7"}],"fields":["identity","value","sale"]}' \
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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/39061-63cdbb30914ac04d52d7JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("39061-63cdbb30914ac04d52d7")}`, {
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);Hamilton County data questions
- How many parcels in Hamilton County include last sale?
- About 330,000 of about 420,000 parcel records (78%) include last sale.
- Does the Korzy API return owner names for Hamilton County parcels?
- Hamilton County parcel records do not include owner names. Values, land use and building facts are returned where the county publishes them.
- How many data-center projects are in Hamilton County?
- Korzy tracks 4 data-center projects in Hamilton County: 3 operating and 1 status not reported. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
- How much power generation is in Hamilton County?
- 4 operable power plants in Hamilton County total about 1,200 MW of nameplate capacity, mainly coal, oil and natural gas.
- Which water systems serve Hamilton County?
- Service areas of about 20 community water systems cover about 97% of Hamilton County, and sewer service areas cover about 89%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
More featured counties
- Butler County, OHBorders Hamilton County · about 170,000 parcels
- Franklin County, OHabout 500,000 parcels
- Cuyahoga County, OHabout 520,000 parcels
Build on Hamilton 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.