How many parcels in St. Charles County include year built?

About 150,000 of about 170,000 parcel records (88%) include year built.

Does the Korzy API return owner names for St. Charles County parcels?

Yes. 99% of St. Charles 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 many data-center projects are in St. Charles County?

Korzy tracks 1 data-center project in St. Charles County: 1 proposed. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.

How much power generation is in St. Charles County?

2 operable power plants in St. Charles County total about 1,100 MW of nameplate capacity, mainly coal and solar.

Which water systems serve St. Charles County?

Service areas of about 20 community water systems cover about 62% of St. Charles County, and sewer service areas cover about 32%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

St. Charles County, MO parcel and infrastructure data API

Korzy has about 170,000 parcel records for St. Charles County, Missouri, with source updates through October 2026. Nearly every record carries owner names, values, last sale and land use; 88% include year built and 88% include building size. In and around the county the API also maps 1 data-center project; 2 power plants with about 1,100 MW of capacity, led by coal; and 2 ports with reported cargo. Look up any parcel by address or coordinates, then check water, sewer and infrastructure context at the same point.

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Parcel coverage in St. Charles County

About 170,000 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:

Field	Coverage	Share
Situs address	Nearly all · 100%
Owner name	Nearly all · 99%
Assessed or market value	Nearly all · 99%
Year built	Most · 88%
Building size	Most · 88%
Last sale	Nearly all · 99%
Land use	Nearly all · 100%
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. 99% of St. Charles County records carry an owner name.

Infrastructure in and around St. Charles County

Power plants

2 operable plants with about 1,100 MW of nameplate capacity; largest by capacity: coal, solar.

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

Substations and transmission

About 45 in-service substations, 4 rated 230 kV or higher.

About 340 miles of transmission lines: 1 mi at under 100 kV; about 280 mi at 100–161 kV; about 65 mi at 345 kV.

Water and sewer service

Service areas of about 20 community water systems cover about 62% of the county.

Sewer service areas of about 25 systems cover about 32%.

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

Data-center projects

1 tracked project: 1 proposed.

Within 10 km: /v1/lookup section datacenters

Flood zones and wetlands

Special flood hazard areas cover about 40% 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 95 miles of active rail, about 60 of it main line
About 25 miles of national freight network highway
2 port areas with reported cargo tonnage

Within 25 km: /v1/lookup section logistics

Example requests for St. Charles 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 8201 MEXICO RD, ST. PETERS, MO 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":"8201 MEXICO RD, ST. PETERS, MO","sections":["utilities"]}' \
  https://api.korzy.co/v1/lookup

Python

import os
import requests

response = requests.post(
    "https://api.korzy.co/v1/lookup",
    json={"address": "8201 MEXICO RD, ST. PETERS, MO", "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": -90.67691808992137,
    "latitude": 38.788433100000006,
    "address": "8201 MEXICO RD, ST. PETERS",
    "match_type": "exact"
  },
  "parcels": {
    "records": [
      {
        "id": "29183-a51f861d65d6eb13f9fd",
        "korzy_id": "29183-a51f861d65d6eb13f9fd",
        "parcelid": "2-0061-S034-00-0004 3100000",
        "parceladdr": "8201 MEXICO RD",
        "parcelcity": "ST. PETERS",
        "situs_zip": "63376",
        "statefp": "29",
        "geoid": "29183",
        "longitude": -90.67691808992137,
        "latitude": 38.788433100000006,
        "usedesc": "IMPROVED COMMERCIAL (C)",
        "land_use_code": "353",
        "yearbuilt": 2000,
        "bldgsqft": 6953,
        "taxacres": 1.79,
        "totalvalue": 0,
        "market_value_usd": 995743,
        "saledate": "2025-03-06",
        "saleamt": 3500000,
        "updated": "2026-10-26"
      }
    ],
    "truncated": false
  },
  "sections": {
    "utilities": {
      "status": "ok",
      "data": {
        "water": [
          {
            "id": "utility:water:41084",
            "feature_id": "water:41084",
            "name": "MO AMERICAN ST LOUIS ST CHARLES COUNTIES",
            "boundary_basis": "System Sourced"
          }
        ],
        "sewer": [
          {
            "id": "utility:sewer:1071",
            "feature_id": "sewer:1071",
            "name": "O'Fallon STP",
            "boundary_basis": "Sourced"
          }
        ],
        "treatment_plants": [
          {
            "id": "utility:treatment:5897",
            "feature_id": "treatment:5897",
            "name": "Spencer Creek STP",
            "distance_km": 6.344718400056155
          },
          {
            "id": "utility:treatment:5895",
            "feature_id": "treatment:5895",
            "name": "O'Fallon STP",
            "distance_km": 6.35791418980584
          },
          {
            "id": "utility:treatment:14972",
            "feature_id": "treatment:14972",
            "name": "DCSD, Steven A. Rogers WWTF",
            "distance_km": 9.885908998764616
          }
        ],
        "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 29183-a51f861d65d6eb13f9fd, 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":"29183-a51f861d65d6eb13f9fd"}],"fields":["identity","sale","owner"]}' \
  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/29183-a51f861d65d6eb13f9fd

JavaScript

const response = await fetch(`https://api.korzy.co/v1/records/${encodeURIComponent("29183-a51f861d65d6eb13f9fd")}`, {
  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);

St. Charles County data questions

How many parcels in St. Charles County include year built?: About 150,000 of about 170,000 parcel records (88%) include year built.
Does the Korzy API return owner names for St. Charles County parcels?: Yes. 99% of St. Charles 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 many data-center projects are in St. Charles County?: Korzy tracks 1 data-center project in St. Charles County: 1 proposed. A /v1/lookup with the datacenters section lists projects within 10 km of any address or point.
How much power generation is in St. Charles County?: 2 operable power plants in St. Charles County total about 1,100 MW of nameplate capacity, mainly coal and solar.
Which water systems serve St. Charles County?: Service areas of about 20 community water systems cover about 62% of St. Charles County, and sewer service areas cover about 32%. A /v1/lookup with the utilities section returns the water and sewer matches at an address or point.

More featured counties

St. Louis County, MOBorders St. Charles County · about 400,000 parcels
Jackson County, MOabout 300,000 parcels

All featured Missouri counties

Build on St. Charles 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 key See pricing API reference Use cases for parcel and infrastructure data