Montgomery County, MD parcel and infrastructure data API

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

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

Infrastructure in and around Montgomery County

Example requests for Montgomery 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 135 GIBBS STREET, ROCKVILLE, 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=135 GIBBS STREET, ROCKVILLE, MD' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "135 GIBBS STREET, ROCKVILLE, 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": "24031-b2ee1123ce6fdf9c3dc2",
      "address": "135 GIBBS STREET",
      "city": "ROCKVILLE",
      "postcode": "20850",
      "county": "Montgomery",
      "statefp": "24",
      "longitude": -77.15178810609004,
      "latitude": 39.08650335,
      "match_type": "exact",
      "parceladdr": "135 GIBBS STREET",
      "parcelcity": "ROCKVILLE",
      "situs_zip": "20850",
      "usedesc": "Retail",
      "yearbuilt": 0,
      "bldgsqft": 8145,
      "taxacres": 19750,
      "saleamt": 33000000,
      "updated": "2026-06-29",
      "geoid": "24031"
    }
  ],
  "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, 24031-b2ee1123ce6fdf9c3dc2, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-77.151788' \
  --data-urlencode 'latitude=39.086503' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-77.151788", "latitude": "39.086503", "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=-77.151788' \
  --data-urlencode 'latitude=39.086503' \
  https://api.korzy.co/api/utilities/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/utilities/context",
    params={"longitude": "-77.151788", "latitude": "39.086503"},
    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": -77.151788,
  "latitude": 39.086503,
  "matches": {
    "water": [
      {
        "feature_id": "water:36912",
        "name": "CITY OF ROCKVILLE",
        "boundary_basis": "System Sourced"
      }
    ],
    "sewer": [
      {
        "feature_id": "sewer:218",
        "name": "BLUE PLAINS STP",
        "boundary_basis": "Sourced"
      }
    ]
  },
  "nearby_treatment": [
    {
      "feature_id": "treatment:11838",
      "name": "SENECA CREEK WWTP",
      "distance_km": 13.40988352810229
    },
    {
      "feature_id": "treatment:11837",
      "name": "DAMASCUS WWTP",
      "distance_km": 18.31124902536851
    }
  ]
}

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

More featured counties

• District of Columbia, DCBorders Montgomery County · about 240,000 parcels
• Frederick County, MDBorders Montgomery County · about 120,000 parcels
• Prince George's County, MDBorders Montgomery County · about 350,000 parcels
• Fairfax County, VABorders Montgomery County · about 370,000 parcels
• Baltimore city, MDabout 240,000 parcels
• Baltimore County, MDabout 370,000 parcels

All featured Maryland counties