Baltimore County, MD parcel and infrastructure data API
Korzy has about 370,000 parcel records for Baltimore County, Maryland, with source updates through August 2026. 94% include year built and 94% include building size. In and around the county the API also maps 2 data-center projects (1 operating); 1 port with reported cargo; and about 25 power plants with about 50 MW of capacity, led by solar. Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.
Parcel coverage in Baltimore County
About 370,000 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 | Nearly all · 99% | |
| Owner name | Not published | |
| Assessed or market value | Most · 79% | |
| Year built | Most · 94% | |
| Building size | Most · 94% | |
| Last sale | Not published | |
| Land use | Most · 93% | |
| Zoning | Not published |
Baltimore County records do not include owner names. See pricing for credit costs.
Infrastructure in and around Baltimore County
Power plants
About 25 operable plants with about 50 MW of nameplate capacity; largest by capacity: solar, other fuels.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 120 in-service substations, 8 rated 230 kV or higher.
About 480 miles of transmission lines: 3 mi at under 100 kV; about 320 mi at 100–161 kV; about 120 mi at 220–287 kV; about 35 mi at 500 kV.
Water and sewer service
Service areas of about 10 community water systems cover about 31% of the county.
Sewer service areas of 7 systems cover about 34%.
At an address or point: /v1/lookup section utilities
Data-center projects
2 tracked projects: 1 operating, 1 proposed. Reported planned capacity: about 150 MW.
Within 10 km: /v1/lookup section datacenters
Flood zones and wetlands
Special flood hazard areas cover about 8% of the county on the current federal flood maps, published May 2026.
Mapped wetlands cover about 2%.
At an address or point: /v1/lookup section environment
Rail, ports and freight
- About 150 miles of active rail, about 65 of it main line
- About 100 miles of national freight network highway
- 1 port area with reported cargo tonnage
Within 25 km: /v1/lookup section logistics
Example requests for Baltimore 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 314 PAYNE AVE, BALTIMORE, MD 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":"314 PAYNE AVE, BALTIMORE, MD","sections":["utilities"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "314 PAYNE AVE, BALTIMORE, MD", "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": -76.5972635901848,
"latitude": 39.40129595,
"address": "314 PAYNE AVE, BALTIMORE",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "24005-4b72ecec57ee22299ebe",
"korzy_id": "24005-4b72ecec57ee22299ebe",
"parcelid": "244653",
"parceladdr": "314 PAYNE AVE",
"parcelcity": "BALTIMORE",
"situs_zip": "00000",
"statefp": "24",
"geoid": "24005",
"longitude": -76.5972635901848,
"latitude": 39.40129595,
"usedesc": "JOPPA-FAIRMOUNT OFFICE",
"yearbuilt": 1988,
"bldgsqft": 123099,
"taxacres": 24463,
"totalvalue": 3834900,
"updated": "2026-08-10"
}
],
"truncated": false
},
"sections": {
"utilities": {
"status": "ok",
"data": {
"water": [
{
"id": "utility:water:37154",
"feature_id": "water:37154",
"name": "CITY OF BALTIMORE",
"boundary_basis": "System Sourced"
}
],
"sewer": [
{
"id": "utility:sewer:719",
"feature_id": "sewer:719",
"name": "BACK RIVER WWTP",
"boundary_basis": "Sourced"
}
],
"treatment_plants": [
{
"id": "utility:treatment:11839",
"feature_id": "treatment:11839",
"name": "RICHLYN MANOR WWTP",
"distance_km": 13.877800908434534
},
{
"id": "utility:treatment:11727",
"feature_id": "treatment:11727",
"name": "BACK RIVER WWTP",
"distance_km": 14.875675110831565
},
{
"id": "utility:treatment:11728",
"feature_id": "treatment:11728",
"name": "Patapsco WWTP",
"distance_km": 18.99444138336713
}
],
"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 24005-4b72ecec57ee22299ebe. 1 credit.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"items":[{"korzy_id":"24005-4b72ecec57ee22299ebe"}],"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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/24005-4b72ecec57ee22299ebeJavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("24005-4b72ecec57ee22299ebe")}`, {
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);Baltimore County data questions
- How many parcels in Baltimore County include year built?
- About 350,000 of about 370,000 parcel records (94%) include year built.
- Does the Korzy API return owner names for Baltimore County parcels?
- Baltimore 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 Baltimore County?
- Korzy tracks 2 data-center projects in Baltimore County: 1 operating and 1 proposed. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
- How much power generation is in Baltimore County?
- About 25 operable power plants in Baltimore County total about 50 MW of nameplate capacity, mainly solar and other fuels.
- Which water systems serve Baltimore County?
- Service areas of about 10 community water systems cover about 31% of Baltimore County, and sewer service areas cover about 34%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
More featured counties
- Baltimore city, MDBorders Baltimore County · about 240,000 parcels
- York County, PABorders Baltimore County · about 180,000 parcels
- Prince George's County, MDabout 350,000 parcels
- Frederick County, MDabout 120,000 parcels
- Montgomery County, MDabout 290,000 parcels
Build on Baltimore 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.