Washington County, MN parcel and infrastructure data API

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

Owner name and mailing address are returned with include_owner=true, which doubles a request's cost: a parcel record costs 2 credits instead of 1. 88% of Washington County records carry an owner name.

Infrastructure in and around Washington County

Example requests for Washington 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 9525 105th Street Court South, Cottage Grove, MN 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=9525 105th Street Court South, Cottage Grove, MN' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "9525 105th Street Court South, Cottage Grove, MN"},
    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": "27163-461e3a46e3f64689ccce",
      "address": "9525 105th Street Court South",
      "city": "Cottage Grove",
      "postcode": "55016",
      "county": "Washington",
      "statefp": "27",
      "longitude": -92.91086832690247,
      "latitude": 44.79566154815869,
      "match_type": "exact",
      "parcelid": "2702721420004",
      "parceladdr": "9525 105th Street Court South",
      "parcelcity": "Cottage Grove",
      "situs_zip": "55016",
      "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",
      "geoid": "27163"
    }
  ],
  "truncated": false
}

With include_owner=true (2 credits) the record adds owner fields, shown here as placeholders:

{
  "owner_name": "EXAMPLE HOLDINGS LLC",
  "owner_mailing_address": "100 EXAMPLE ST, SAMPLE CITY, ST 00000"
}

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, 27163-461e3a46e3f64689ccce, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-92.910868' \
  --data-urlencode 'latitude=44.795662' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-92.910868", "latitude": "44.795662", "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=-92.910868' \
  --data-urlencode 'latitude=44.795662' \
  https://api.korzy.co/api/utilities/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/utilities/context",
    params={"longitude": "-92.910868", "latitude": "44.795662"},
    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": -92.910868,
  "latitude": 44.795662,
  "matches": {
    "water": [
      {
        "feature_id": "water:37971",
        "name": "Cottage Grove",
        "boundary_basis": "System Sourced"
      }
    ],
    "sewer": []
  },
  "nearby_treatment": [
    {
      "feature_id": "treatment:7087",
      "name": "MCES - Eagles Point WWTF",
      "distance_km": 1.1798541420026338
    },
    {
      "feature_id": "treatment:7081",
      "name": "HASTINGS WWTP (current)",
      "distance_km": 7.511786683945813
    }
  ]
}

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. Add include_owner=true to a point, search or parcel-record request; it doubles the request's cost, so a single parcel record costs 2 credits.

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%. /api/utilities/context returns the water and sewer matches at a 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

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