Washington County, MN parcel and infrastructure data API
Korzy has about 130,000 parcel records for Washington County, Minnesota, with source updates through November 2026. Nearly every record carries values, last sale, land use, year built and building size; 88% include owner names. In and around the county the API also maps about 20 power plants with about 930 MW of capacity, led by coal; and about 85 miles of active rail. Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.
Parcel coverage in Washington County
About 130,000 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 | Most · 88% | |
| Assessed or market value | Nearly all · 99% | |
| Year built | Nearly all · 98% | |
| Building size | Nearly all · 98% | |
| Last sale | Nearly all · 97% | |
| Land use | Nearly all · 99% | |
| Zoning | Not published |
Owner name and mailing address are returned by /v1/enrich with the owner group, at 2 credits per parcel instead of 1 credit. 88% of Washington County records carry an owner name.
Infrastructure in and around Washington County
Power plants
About 20 operable plants with about 930 MW of nameplate capacity; largest by capacity: coal, natural gas, battery and pumped storage.
Within 50 km: /v1/lookup section power; details: /v1/records/{id}
Substations and transmission
About 15 in-service substations, 2 rated 230 kV or higher.
About 290 miles of transmission lines: 7 mi at under 100 kV; about 90 mi at 100–161 kV; about 35 mi at 220–287 kV; about 140 mi at 345 kV.
Water and sewer service
Service areas of about 35 community water systems cover about 21% of the county.
Sewer service areas of 4 systems cover about 21%.
At an address or point: /v1/lookup section utilities
Flood zones and wetlands
Special flood hazard areas cover about 14% of the county on the current federal flood maps, published October 2026.
Mapped wetlands cover about 8%.
At an address or point: /v1/lookup section environment
Rail, ports and freight
- About 85 miles of active rail, about 70 of it main line
- About 25 miles of national freight network highway
Within 25 km: /v1/lookup section logistics
Example requests for Washington 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 9525 105th Street Court South, Cottage Grove, MN 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":"9525 105th Street Court South, Cottage Grove, MN","sections":["utilities"]}' \
https://api.korzy.co/v1/lookupPython
import os
import requests
response = requests.post(
"https://api.korzy.co/v1/lookup",
json={"address": "9525 105th Street Court South, Cottage Grove, MN", "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": -92.91086832690247,
"latitude": 44.79566154815869,
"address": "9525 105th Street Court South, Cottage Grove",
"match_type": "exact"
},
"parcels": {
"records": [
{
"id": "27163-461e3a46e3f64689ccce",
"korzy_id": "27163-461e3a46e3f64689ccce",
"parcelid": "2702721420004",
"parceladdr": "9525 105th Street Court South",
"parcelcity": "Cottage Grove",
"situs_zip": "55016",
"statefp": "27",
"geoid": "27163",
"longitude": -92.91086832690247,
"latitude": 44.79566154815869,
"usedesc": "305",
"yearbuilt": 0,
"bldgsqft": 0,
"taxacres": 0,
"totalvalue": 4169800,
"land_value_usd": 1335400,
"improvement_value_usd": 2834400,
"market_value_usd": 4169800,
"saleamt": 0,
"updated": "2026-11-03"
}
],
"truncated": false
},
"sections": {
"utilities": {
"status": "ok",
"data": {
"water": [
{
"id": "utility:water:37971",
"feature_id": "water:37971",
"name": "Cottage Grove",
"boundary_basis": "System Sourced"
}
],
"treatment_plants": [
{
"id": "utility:treatment:7087",
"feature_id": "treatment:7087",
"name": "MCES - Eagles Point WWTF",
"distance_km": 1.1797980025150687
},
{
"id": "utility:treatment:7081",
"feature_id": "treatment:7081",
"name": "HASTINGS WWTP (current)",
"distance_km": 7.511766918070023
},
{
"id": "utility:treatment:12658",
"feature_id": "treatment:12658",
"name": "PRESCOTT WWTP",
"distance_km": 11.033473880920516
}
],
"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 owner and sale fields
/v1/enrich returns the fields you choose for up to 25 parcels per request; here the parcel 27163-461e3a46e3f64689ccce, with the owner group. 2 credits.
curl --fail-with-body -sS \
-H "Authorization: Bearer $KORZY_API_KEY" \
-H "Content-Type: application/json" \
-d '{"items":[{"korzy_id":"27163-461e3a46e3f64689ccce"}],"fields":["identity","sale","owner"]}' \
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 $KORZY_API_KEY" \
https://api.korzy.co/v1/records/27163-461e3a46e3f64689ccceJavaScript
const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("27163-461e3a46e3f64689ccce")}`, {
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);Washington County data questions
- How many parcels in Washington County include year built?
- About 130,000 of about 130,000 parcel records (98%) include year built.
- Does the Korzy API return owner names for Washington County parcels?
- Yes. 88% of Washington County parcel records carry an owner name. Ask /v1/enrich for the owner group; each parcel then costs 2 credits instead of 1 credit. Lookups and records never include owner fields.
- How much power generation is in Washington County?
- About 20 operable power plants in Washington County total about 930 MW of nameplate capacity, mainly coal, natural gas and battery and pumped storage.
- Which water systems serve Washington County?
- Service areas of about 35 community water systems cover about 21% of Washington County, and sewer service areas cover about 21%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.
- How much of Washington County is in a mapped flood zone?
- About 14% of Washington County's area falls within special flood hazard areas on the current federal flood maps, and mapped wetlands cover about 8%.
More featured counties
- Anoka County, MNBorders Washington County · about 150,000 parcels
- Dakota County, MNBorders Washington County · about 170,000 parcels
- Ramsey County, MNBorders Washington County · about 170,000 parcels
- Hennepin County, MNabout 450,000 parcels
- St. Louis County, MNabout 190,000 parcels
Build on Washington 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.