Jefferson County, CO parcel and infrastructure data API

Parcel coverage in Jefferson County

About 260,000 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:

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. 87% of Jefferson County records carry an owner name.

Infrastructure in and around Jefferson County

Example requests for Jefferson 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 10777 W 6TH AVE FRONTAGE RD, LAKEWOOD, CO 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=10777 W 6TH AVE FRONTAGE RD, LAKEWOOD, CO' \
  https://api.korzy.co/api/search

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/search",
    params={"q": "10777 W 6TH AVE FRONTAGE RD, LAKEWOOD, CO"},
    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": "08059-29e8d1e47c735e452cb7",
      "address": "10777 W 6TH AVE FRONTAGE RD",
      "city": "LAKEWOOD",
      "postcode": "80215",
      "county": "Jefferson",
      "statefp": "08",
      "longitude": -105.11794037235398,
      "latitude": 39.7261398,
      "match_type": "exact",
      "parcelid": "49-044-20-005",
      "parceladdr": "10777 W 6TH AVE FRONTAGE RD",
      "parcelcity": "LAKEWOOD",
      "situs_zip": "80215",
      "usedesc": "General Retail",
      "taxacres": 3.396,
      "totalvalue": 1066095,
      "assessed_value_usd": 1066095,
      "market_value_usd": 3948500,
      "saledate": "2025-10-08",
      "saleamt": 4525700,
      "updated": "2026-04-21",
      "geoid": "08059"
    }
  ],
  "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, 08059-29e8d1e47c735e452cb7, in records. 1 credit per 10 records requested.

curl --fail-with-body -sS --get \
  -H "Authorization: Bearer $KORZY_API_KEY" \
  --data-urlencode 'longitude=-105.11794' \
  --data-urlencode 'latitude=39.72614' \
  --data-urlencode 'limit=5' \
  https://api.korzy.co/api/query/point

const params = new URLSearchParams({"longitude": "-105.11794", "latitude": "39.72614", "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=-105.11794' \
  --data-urlencode 'latitude=39.72614' \
  https://api.korzy.co/api/utilities/context

import os
import requests

response = requests.get(
    "https://api.korzy.co/api/utilities/context",
    params={"longitude": "-105.11794", "latitude": "39.72614"},
    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": -105.11794,
  "latitude": 39.72614,
  "matches": {
    "water": [
      {
        "feature_id": "water:43242",
        "name": "CONSOLIDATED MUTUAL MAPLE GROVE",
        "boundary_basis": "System Sourced"
      }
    ],
    "sewer": [
      {
        "feature_id": "sewer:4738",
        "name": "Metro Wastewater Reclamation District",
        "boundary_basis": "Modeled"
      }
    ]
  },
  "nearby_treatment": [
    {
      "feature_id": "treatment:184",
      "name": "Golden WWTP",
      "distance_km": 9.11775231245496
    },
    {
      "feature_id": "treatment:436",
      "name": "MORRISON WWTP",
      "distance_km": 9.589669322736315
    }
  ]
}

Jefferson County data questions

How many parcels in Jefferson County include last sale?

About 230,000 of about 260,000 parcel records (88%) include last sale.

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

Yes. 87% of Jefferson 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 many data-center projects are in Jefferson County?

Korzy tracks 1 data-center project in Jefferson County: 1 operating. /api/datacenters/context lists projects within 10 km of any point.

How much power generation is in Jefferson County?

5 operable power plants in Jefferson County total about 270 MW of nameplate capacity, mainly natural gas and solar.

Which water systems serve Jefferson County?

Service areas of about 55 community water systems cover about 24% of Jefferson County, and sewer service areas cover about 26%. /api/utilities/context returns the water and sewer matches at a point.

More featured counties

• Adams County, COBorders Jefferson County · about 190,000 parcels
• Arapahoe County, COBorders Jefferson County · about 230,000 parcels
• Denver County, COBorders Jefferson County · about 240,000 parcels
• Douglas County, COBorders Jefferson County · about 160,000 parcels

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