O'Fallon, IL ZIP Code
O'Fallon, Illinois has one ZIP code: .
Mail addressed to O'Fallon covers nearby places too.
Where the 62269 ZIP code reaches
Tap or point to an area to see its ZIP code.Full-size map
Dashed line: O'Fallon city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
Check an address in O'Fallon
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
ZIP codes from nearby towns that reach into O'Fallon
- 62254, mailing town Lebanon, covers 5 percent of O'Fallon
Why your mail may say O'Fallon when you live outside it
O'Fallon ZIP codes also cover O'Fallon Township, Caseyville Township and Shiloh, so a letter addressed to O'Fallon can go to a home outside the city limits.
The reverse happens too: parts of O'Fallon use 62254, which mails under a neighboring town's name.
A ZIP code does not set your city, school district or tax. St. Clair County property records show which city you are in.
O'Fallon ZIP code questions
What is the main ZIP code for O'Fallon?
62269, the ZIP code of the main O Fallon post office at 1111 S Lincoln Ave.
What county is O'Fallon in?
St. Clair County.
ZIP codes for towns near O'Fallon
More towns near O'Fallon: St. Charles, Chesterfield, St. Peters, Wildwood, O'Fallon, Wentzville, Springfield, Cape Girardeau, Decatur.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections