O'Fallon parcel data

Parcel records for O'Fallon, Illinois: owners, assessed values, sales and boundaries.
Parcels
10,894
Last updated
Oct 6, 2026
Zoning
Not yet
County
St. Clair County

What each O'Fallon parcel record includes

  • Parcel number and boundary
  • Owners of record and mailing address
  • Assessed and market value
  • Most recent sale: price, date and deed
  • Lot size, land use and property class
  • Building: year built, area and units
  • Legal description
  • Zoning district
Example parcel · O'Fallon2.14 ac
Parcel number0651-45-8213
Owner of recordExample Holdings LLC
Market value 2026$486,300
Last sale$412,000 · 2021
Land useSingle family
Year built1998

Get O'Fallon parcels through the API

Search by address, owner, lot size, value or sale date.

Get an API keyRead the API docs 
curl -G 'https://api.placestack.com/v1/parcel' \
  -H "Authorization: Bearer $PLACESTACK_API_KEY" \
  --data-urlencode 'jurisdiction=jur_01m3n2c1pffqwt8v10mt3kj9qj'

Frequently asked questions

How many parcels are in O'Fallon?
Placestack has 10,894 parcel records for O'Fallon, Illinois.
What does a O'Fallon parcel record include?
The parcel number and boundary, owners of record and their mailing address, assessed and market value, the most recent sale, lot size, land use, the main building and the legal description.
Is O'Fallon zoning available?
Not yet for O'Fallon. Parcel records are available now.
How do I get O'Fallon parcel data?
Through the API, the MCP server or the map in the console.

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