Baltimore County, MD parcel and infrastructure data API

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

Baltimore County records do not include owner names. See pricing for credit costs.

Infrastructure in and around Baltimore County

Example requests for Baltimore 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 314 PAYNE AVE, BALTIMORE, MD 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=314 PAYNE AVE, BALTIMORE, MD' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "314 PAYNE AVE, BALTIMORE, MD"},
    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": "24005-4b72ecec57ee22299ebe",
      "address": "314 PAYNE AVE",
      "city": "BALTIMORE",
      "postcode": "00000",
      "county": "Baltimore",
      "statefp": "24",
      "longitude": -76.5972635901848,
      "latitude": 39.40129595,
      "match_type": "exact",
      "parcelid": "244653",
      "parceladdr": "314 PAYNE AVE",
      "parcelcity": "BALTIMORE",
      "situs_zip": "00000",
      "usedesc": "JOPPA-FAIRMOUNT OFFICE",
      "yearbuilt": 1988,
      "bldgsqft": 123099,
      "taxacres": 24463,
      "totalvalue": 3834900,
      "updated": "2026-08-10",
      "geoid": "24005"
    }
  ],
  "truncated": false
}

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, 24005-4b72ecec57ee22299ebe, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-76.597264' \
  --data-urlencode 'latitude=39.401296' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-76.597264", "latitude": "39.401296", "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 water and sewer service

/api/utilities/context returns the water and sewer service areas at the point and the nearest treatment plants. 1 credit.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-76.597264' \
  --data-urlencode 'latitude=39.401296' \
  https://api.korzy.co/api/utilities/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/utilities/context",
    params={"longitude": "-76.597264", "latitude": "39.401296"},
    headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
    timeout=30,
)
response.raise_for_status()
matches = response.json()["matches"]
print([area["name"] for area in matches["water"]])

{
  "longitude": -76.597264,
  "latitude": 39.401296,
  "matches": {
    "water": [
      {
        "feature_id": "water:37154",
        "name": "CITY OF BALTIMORE",
        "boundary_basis": "System Sourced"
      }
    ],
    "sewer": [
      {
        "feature_id": "sewer:719",
        "name": "BACK RIVER WWTP",
        "boundary_basis": "Sourced"
      }
    ]
  },
  "nearby_treatment": [
    {
      "feature_id": "treatment:11839",
      "name": "RICHLYN MANOR WWTP",
      "distance_km": 13.877834572471107
    },
    {
      "feature_id": "treatment:11727",
      "name": "BACK RIVER WWTP",
      "distance_km": 14.875701016104761
    }
  ]
}

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. /api/datacenters/context lists projects within 10 km of any 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%. /api/utilities/context returns the water and sewer matches at a 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

All featured Maryland counties