Fairfax County, VA parcel and infrastructure data API

Parcel coverage in Fairfax County

About 370,000 parcel records with boundaries, situs addresses and parcel numbers, with the latest source update from October 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:

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

Infrastructure in and around Fairfax County

Example requests for Fairfax 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 7990 QUANTUM DR, VIENNA, VA 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=7990 QUANTUM DR, VIENNA, VA' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "7990 QUANTUM DR, VIENNA, VA"},
    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": "51059-ac5fd4e08e15fb80e6c4",
      "address": "7990 QUANTUM DR",
      "city": "VIENNA",
      "postcode": "22182",
      "county": "Fairfax",
      "statefp": "51",
      "longitude": -77.22076544846995,
      "latitude": 38.909007700000004,
      "match_type": "exact",
      "parcelid": "0392 01 0013D",
      "parceladdr": "7990 QUANTUM DR",
      "parcelcity": "VIENNA",
      "situs_zip": "22182",
      "totalvalue": 36900240,
      "saledate": "2016-12-27",
      "saleamt": 69000000,
      "updated": "2026-08-09",
      "geoid": "51059"
    }
  ],
  "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, 51059-ac5fd4e08e15fb80e6c4, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-77.220765' \
  --data-urlencode 'latitude=38.909008' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-77.220765", "latitude": "38.909008", "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 nearby data-center projects

/api/datacenters/context lists data-center projects within 10 km of the point, nearest first. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-77.220765' \
  --data-urlencode 'latitude=38.909008' \
  --data-urlencode 'radius_km=10' \
  --data-urlencode 'limit=3' \
  https://api.korzy.co/api/datacenters/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/datacenters/context",
    params={"longitude": "-77.220765", "latitude": "38.909008", "radius_km": "10", "limit": "3"},
    headers={"Authorization": f"Bearer {os.environ['KORZY_API_KEY']}"},
    timeout=30,
)
response.raise_for_status()
for project in response.json()["projects"]:
    print(project["name"], project["status"], project["distance_km"])

{
  "projects": [
    {
      "project_id": "dc_e1ab7b49539bd2eaef43",
      "name": "Equinix DC7",
      "operator": "Equinix",
      "status": "unknown",
      "state": "VA",
      "longitude": -77.22055296079115,
      "latitude": 38.9091534,
      "location_precision": "footprint",
      "distance_km": 0.024454110322224727
    },
    {
      "project_id": "dc_3a7945bf1549a7dcd1e5",
      "name": "Element Critical VA1",
      "status": "unknown",
      "state": "VA",
      "longitude": -77.21974420000001,
      "latitude": 38.9083675,
      "location_precision": "footprint",
      "distance_km": 0.11346289527372755
    },
    {
      "project_id": "dc_969596494cc1a87f54c1",
      "name": "Unnamed data center",
      "status": "unknown",
      "state": "VA",
      "longitude": -77.22583323152261,
      "latitude": 38.91371305,
      "location_precision": "footprint",
      "distance_km": 0.6826522125715134
    }
  ],
  "radius_km": 10,
  "limit": 3,
  "truncated": true
}

Fairfax County data questions

How many parcels in Fairfax County include last sale?

About 260,000 of about 370,000 parcel records (70%) include last sale.

Does the Korzy API return owner names for Fairfax County parcels?

Fairfax 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 Fairfax County?

Korzy tracks about 30 data-center projects in Fairfax County: 25 status not reported, 5 operating and 2 under construction. /api/datacenters/context lists projects within 10 km of any point.

How much power generation is in Fairfax County?

4 operable power plants in Fairfax County total about 130 MW of nameplate capacity, mainly other fuels and solar.

Which water systems serve Fairfax County?

Service areas of 9 community water systems cover about 66% of Fairfax County, and sewer service areas cover about 41%. /api/utilities/context returns the water and sewer matches at a point.

More featured counties

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• Prince William County, VABorders Fairfax County · about 160,000 parcels
• Chesterfield County, VAabout 140,000 parcels
• Fauquier County, VAabout 36,000 parcels
• Spotsylvania County, VAabout 69,000 parcels

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