Frederick County, MD parcel and infrastructure data API
Korzy has about 120,000 parcel records for Frederick County, Maryland, with source updates through November 2026. 82% include land use and 81% include values. In and around the county the API also maps 7 data-center projects (1 operating and 3 under construction); 9 power plants with about 85 MW of capacity, led by solar; and about 90 miles of active rail. 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 Frederick County
About 120,000 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 | Not published | |
| Assessed or market value | Most · 81% | |
| Year built | Most · 75% | |
| Building size | Many · 74% | |
| Last sale | Most · 78% | |
| Land use | Most · 82% | |
| Zoning | Many · 43% |
Frederick County records do not include owner names. See pricing for credit costs.
Infrastructure in and around Frederick County
Power plants
9 operable plants with about 85 MW of nameplate capacity; largest by capacity: solar, battery and pumped storage.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 35 in-service substations, about 15 rated 230 kV or higher.
About 270 miles of transmission lines: 6 mi at under 100 kV; about 40 mi at 100–161 kV; about 170 mi at 220–287 kV; about 50 mi at 500 kV.
Water and sewer service
Service areas of about 35 community water systems cover about 8% of the county.
Sewer service areas of about 20 systems cover about 14%.
At an address or point: /v1/lookup section utilities
Data-center projects
7 tracked projects: 1 operating, 3 under construction, 2 permitted, 1 status not reported. Reported planned capacity: about 440 MW.
Within 10 km: /v1/lookup section datacenters
Flood zones and wetlands
Special flood hazard areas cover about 7% of the county on the current federal flood maps, published May 2026.
Mapped wetlands cover about 1%.
At an address or point: /v1/lookup section environment
Rail, ports and freight
- About 90 miles of active rail, about 75 of it main line
- About 40 miles of national freight network highway
Within 25 km: /v1/lookup section logistics
Example requests for Frederick 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 520 N MARKET ST, FREDERICK, MD 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":"520 N MARKET ST, FREDERICK, MD","sections":["datacenters"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "520 N MARKET ST, FREDERICK, MD", "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": -77.40939152086702,
"latitude": 39.42112255,
"address": "520 N MARKET ST, FREDERICK",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "24021-629335f0af52597e671f",
"korzy_id": "24021-629335f0af52597e671f",
"parceladdr": "520 N MARKET ST",
"parcelcity": "FREDERICK",
"situs_zip": "21701",
"statefp": "24",
"geoid": "24021",
"longitude": -77.40939152086702,
"latitude": 39.42112255,
"usedesc": "Commercial",
"land_use_code": "C",
"zoning_code": "DB",
"yearbuilt": 2019,
"bldgsqft": 95435,
"taxacres": 1.23,
"land_value_usd": 535700,
"improvement_value_usd": 4106600,
"market_value_usd": 4642300,
"saledate": "2016-12-21",
"updated": "2026-11-03"
}
],
"truncated": false
},
"sections": {
"datacenters": {
"status": "ok",
"data": {
"radius_km": 10,
"projects": [
{
"id": "datacenter:dc_04ab34ecac03ab2d6f75",
"project_id": "dc_04ab34ecac03ab2d6f75",
"name": "Unnamed data center",
"status": "unknown",
"state": "MD",
"longitude": -77.41160078667836,
"latitude": 39.377725299999994,
"location_precision": "footprint",
"source_count": 2,
"source_date": "2026-02-09",
"mapped": true,
"distance_km": 4.829293094640663
}
],
"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 value and sale fields
/v1/enrich returns the fields you choose for up to 25 parcels per request; here the parcel 24021-629335f0af52597e671f. 1 credit.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"items":[{"korzy_id":"24021-629335f0af52597e671f"}],"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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/24021-629335f0af52597e671fJavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("24021-629335f0af52597e671f")}`, {
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);Frederick County data questions
- How many parcels in Frederick County include year built?
- About 90,000 of about 120,000 parcel records (75%) include year built.
- Does the Korzy API return owner names for Frederick County parcels?
- Frederick 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 Frederick County?
- Korzy tracks 7 data-center projects in Frederick County: 3 under construction, 2 permitted and 1 operating. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
- How much power generation is in Frederick County?
- 9 operable power plants in Frederick County total about 85 MW of nameplate capacity, mainly solar and battery and pumped storage.
- Which water systems serve Frederick County?
- Service areas of about 35 community water systems cover about 8% of Frederick County, and sewer service areas cover about 14%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
More featured counties
- Montgomery County, MDBorders Frederick County · about 290,000 parcels
- Baltimore city, MDabout 240,000 parcels
- Prince George's County, MDabout 350,000 parcels
- Baltimore County, MDabout 370,000 parcels
Build on Frederick 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.