# St. Louis County, MO property data

> St. Louis County, MO parcel data: 400,777 parcels with tax assessor records, building permits, zoning, historic designations, building codes, via API, MCP server and vector tiles.

Source: https://www.parceled.ai/coverage/missouri/st-louis-county  
Publisher: Parceled (https://www.parceled.ai)  
Updated: 2026-10-30

Parceled covers 400,777 parcels in St. Louis County, MO, with tax assessor records, building permits, zoning, historic designations, building codes and hail history available through one API and MCP server. Tax assessor attributes are present for 98% of parcels (owner names on 90% of those records, year built on 94%).

- **Parcels:** 400,777
- **County FIPS:** 29189
- **Snapshot:** October 30, 2026

## What property data is available for St. Louis County?

| Dataset | St. Louis County |
| --- | --- |
| Parcel boundaries | 400,777 parcels |
| Tax assessor records | 394,130 records (98% of parcels) |
| Owner name and mailing address | 90% of assessor records |
| Market or assessed value | 100% of assessor records |
| Year built | 94% of assessor records |
| Last sale date | 0% of assessor records |
| Building permits | 532,094 permits since 2016, latest September 15, 2026 |
| Roofing permits | 586 |
| Zoning | 1 zoning jurisdiction |
| Buildable-area screens | Yes |
| Historic designations | 209 |
| Adopted building codes | 4 jurisdictions |
| Hail history (radar) | Yes, every county in the contiguous US |

## How do I query St. Louis County property data?

Bulk-search every parcel in the county with `search_properties` using `state: "MO"` and `county: "189"` (the county FIPS code 29189), or look up one address with `search_parcels`. Check any single property for free with `check_availability`.

```json
{
  "name": "count_properties",
  "arguments": { "state": "MO", "county": "189" }
}
```

## Frequently asked questions

### How do I find who owns a property in St. Louis County?

Search the address on the St. Louis County assessor's website, or query Parceled's `search_parcels` for owner name and mailing address. See [how to find a property owner by address](https://www.parceled.ai/guides/how-to-find-property-owner-by-address).