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Montgomery County, MD parcel and infrastructure data API

Korzy has about 290,000 parcel records for Montgomery County, Maryland, with source updates through June 2026. Nearly every record carries land use, year built and building size; 75% include last sale. In and around the county the API also maps 2 data-center projects (1 operating); about 15 power plants with about 500 MW of capacity, led by natural gas; and about 40 miles of active rail. Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.

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Parcel coverage in Montgomery County

About 290,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from June 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:

FieldCoverageShare
Situs addressNearly all · 100%
Owner nameNot published
Assessed or market valueNot published
Year builtNearly all · 98%
Building sizeNearly all · 98%
Last saleMost · 75%
Land useNearly all · 98%
ZoningNot published

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

Infrastructure in and around Montgomery County

Power plants

About 15 operable plants with about 500 MW of nameplate capacity; largest by capacity: natural gas, other fuels, solar.

Within 50 km: /v1/lookup section power; details: /v1/records/{id}

Substations and transmission

About 50 in-service substations, about 10 rated 230 kV or higher.

About 370 miles of transmission lines: 1 mi at under 100 kV; about 20 mi at 100–161 kV; about 240 mi at 220–287 kV; about 45 mi at 500 kV.

Water and sewer service

Service areas of 7 community water systems cover about 57% of the county.

Sewer service areas of about 10 systems cover about 47%.

At an address or point: /v1/lookup section utilities

Data-center projects

2 tracked projects: 1 operating, 1 status not reported. Reported planned capacity: about 35 MW.

Within 10 km: /v1/lookup section datacenters

Grid capacity data

2 utility-published grid capacity layers cover parts of Montgomery County, including load headroom.

Nearby records: /v1/lookup section grid

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 3%.

At an address or point: /v1/lookup section environment

Rail, ports and freight

  • About 40 miles of active rail, about 30 of it main line
  • About 40 miles of national freight network highway

Within 25 km: /v1/lookup section logistics

Example requests for Montgomery 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 20904 BOURNEFIELD, BOURNEFIELD, 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":"20904 BOURNEFIELD, BOURNEFIELD, MD","sections":["utilities"]}' \
  https://api.korzy.co/v1/lookup
Python
import os
import requests

response = requests.post(
    "https://api.korzy.co/v1/lookup",
    json={"address": "20904 BOURNEFIELD, BOURNEFIELD, 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": -76.9608220653663,
    "latitude": 39.0542032,
    "address": "20904 BOURNEFIELD BOURNEFIELD MN, BOURNEFIELD",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "24031-6d3c86a7b254d497af80",
        "korzy_id": "24031-6d3c86a7b254d497af80",
        "parceladdr": "20904 BOURNEFIELD BOURNEFIELD MN",
        "parcelcity": "BOURNEFIELD",
        "situs_zip": "20904",
        "statefp": "24",
        "geoid": "24031",
        "longitude": -76.9608220653663,
        "latitude": 39.0542032,
        "usedesc": "Office",
        "yearbuilt": 2004,
        "bldgsqft": 35243,
        "taxacres": 150830,
        "saledate": "2022-02-25",
        "saleamt": 11100000,
        "updated": "2026-06-29"
      }
    ],
    "truncated": false
  },
  "sections": {
    "utilities": {
      "status": "ok",
      "data": {
        "water": [
          {
            "id": "utility:water:37151",
            "feature_id": "water:37151",
            "name": "WASHINGTON SUBURBAN SANITARY COMMISSION",
            "boundary_basis": "System Sourced"
          }
        ],
        "sewer": [
          {
            "id": "utility:sewer:218",
            "feature_id": "sewer:218",
            "name": "BLUE PLAINS STP",
            "boundary_basis": "Sourced"
          }
        ],
        "treatment_plants": [
          {
            "id": "utility:treatment:13599",
            "feature_id": "treatment:13599",
            "name": "PARKWAY STP",
            "distance_km": 11.107165492452378
          },
          {
            "id": "utility:treatment:11730",
            "feature_id": "treatment:11730",
            "name": "MARYLAND CITY WWTP",
            "distance_km": 12.248806545814984
          },
          {
            "id": "utility:treatment:11747",
            "feature_id": "treatment:11747",
            "name": "Little Patuxent WWTP",
            "distance_km": 15.019280881728239
          }
        ],
        "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 24031-6d3c86a7b254d497af80. 1 credit.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"items":[{"korzy_id":"24031-6d3c86a7b254d497af80"}],"fields":["identity","value","sale"]}' \
  https://api.korzy.co/v1/enrich

3. 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 $KORZY_API_KEY" \
  https://api.korzy.co/v1/records/24031-6d3c86a7b254d497af80
JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("24031-6d3c86a7b254d497af80")}`, {
  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);

Montgomery County data questions

How many parcels in Montgomery County include year built?
About 280,000 of about 290,000 parcel records (98%) include year built.
Does the Korzy API return owner names for Montgomery County parcels?
Montgomery 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 Montgomery County?
Korzy tracks 2 data-center projects in Montgomery County: 1 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 Montgomery County?
About 15 operable power plants in Montgomery County total about 500 MW of nameplate capacity, mainly natural gas, other fuels and solar.
Which water systems serve Montgomery County?
Service areas of 7 community water systems cover about 57% of Montgomery County, and sewer service areas cover about 47%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

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Build on Montgomery 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.

Get an API keySee pricingAPI referenceUse cases for parcel and infrastructure data