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Fairfax County, VA parcel and infrastructure data API

Korzy has about 370,000 parcel records for Fairfax County, Virginia, with source updates through October 2026. Nearly every record carries values; 70% include last sale. In and around the county the API also maps about 30 data-center projects (5 operating and 2 under construction); 4 power plants with about 130 MW of capacity, led by other fuels; and about 35 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.

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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 /v1/records/{id}. Share of records with each field:

FieldCoverageShare
Situs addressNearly all · 96%
Owner nameNot published
Assessed or market valueNearly all · 98%
Year builtNot published
Building sizeNot published
Last saleMany · 70%
Land useNot published
ZoningNot published

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

Infrastructure in and around Fairfax County

Power plants

4 operable plants with about 130 MW of nameplate capacity; largest by capacity: other fuels, solar.

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

Substations and transmission

About 60 in-service substations, about 45 rated 230 kV or higher.

About 310 miles of transmission lines: about 10 mi at 100–161 kV; about 270 mi at 220–287 kV; about 20 mi at 500 kV.

Water and sewer service

Service areas of 9 community water systems cover about 66% of the county.

Sewer service areas of 6 systems cover about 41%.

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

Data-center projects

About 30 tracked projects: 5 operating, 2 under construction, 25 status not reported.

Within 10 km: /v1/lookup section datacenters

Flood zones and wetlands

Special flood hazard areas cover about 9% of the county on the current federal flood maps, published October 2026.

Mapped wetlands cover about 3%.

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

Rail, ports and freight

  • About 35 miles of active rail, about 30 of it main line
  • About 50 miles of national freight network highway

Within 25 km: /v1/lookup section logistics

Example requests for Fairfax 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 7990 QUANTUM DR, VIENNA, VA 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":"7990 QUANTUM DR, VIENNA, VA","sections":["datacenters"]}' \
  https://api.korzy.co/v1/lookup
Python
import os
import requests

response = requests.post(
    "https://api.korzy.co/v1/lookup",
    json={"address": "7990 QUANTUM DR, VIENNA, VA", "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": -77.22076544846995,
    "latitude": 38.909007700000004,
    "address": "7990 QUANTUM DR, VIENNA",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "51059-ac5fd4e08e15fb80e6c4",
        "korzy_id": "51059-ac5fd4e08e15fb80e6c4",
        "parcelid": "0392 01 0013D",
        "parceladdr": "7990 QUANTUM DR",
        "parcelcity": "VIENNA",
        "situs_zip": "22182",
        "statefp": "51",
        "geoid": "51059",
        "longitude": -77.22076544846995,
        "latitude": 38.909007700000004,
        "totalvalue": 36900240,
        "saledate": "2016-12-27",
        "saleamt": 69000000,
        "updated": "2026-08-09"
      }
    ],
    "truncated": false
  },
  "sections": {
    "datacenters": {
      "status": "ok",
      "data": {
        "radius_km": 10,
        "projects": [
          {
            "id": "datacenter:dc_e1ab7b49539bd2eaef43",
            "project_id": "dc_e1ab7b49539bd2eaef43",
            "name": "Equinix DC7",
            "operator": "Equinix",
            "status": "unknown",
            "state": "VA",
            "address": "7990 Quantum Drive",
            "longitude": -77.22055296079115,
            "latitude": 38.9091534,
            "location_precision": "footprint",
            "source_count": 2,
            "source_date": "2026-02-09",
            "mapped": true,
            "distance_km": 0.024505278342094615
          },
          {
            "id": "datacenter:dc_3a7945bf1549a7dcd1e5",
            "project_id": "dc_3a7945bf1549a7dcd1e5",
            "name": "Element Critical VA1",
            "status": "unknown",
            "state": "VA",
            "address": "7980 Quantum Drive",
            "longitude": -77.21974420000001,
            "latitude": 38.9083675,
            "location_precision": "footprint",
            "source_count": 2,
            "source_date": "2026-02-09",
            "mapped": true,
            "distance_km": 0.11347217505332208
          },
          {
            "id": "datacenter:dc_969596494cc1a87f54c1",
            "project_id": "dc_969596494cc1a87f54c1",
            "name": "Unnamed data center",
            "status": "unknown",
            "state": "VA",
            "address": "8100 Boone Boulevard",
            "longitude": -77.22583323152261,
            "latitude": 38.91371305,
            "location_precision": "footprint",
            "source_count": 2,
            "source_date": "2026-02-09",
            "mapped": true,
            "distance_km": 0.6826528547252689
          }
        ],
        "truncated": true,
        "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 51059-ac5fd4e08e15fb80e6c4. 1 credit.

curl --fail-with-body -sS \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"items":[{"korzy_id":"51059-ac5fd4e08e15fb80e6c4"}],"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 $KORZY_API_KEY" \
  https://api.korzy.co/v1/records/51059-ac5fd4e08e15fb80e6c4
JavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("51059-ac5fd4e08e15fb80e6c4")}`, {
  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);

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. A /v1/lookup with the datacenters section lists projects within 10 km of any address or 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%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

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Build on Fairfax 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