Williamson County ZIP Codes
Illinois, United States · 11 codes
Williamson County in Illinois has 11 ZIP codes, from 62841 to 62974, serving 11 places.
ZIP codes in Williamson
Frequently asked questions
What is the ZIP code of Williamson?
Williamson has 11 ZIP codes, from 62841 to 62974. The table lists the places each one serves.
How many places are listed in Williamson County?
11 places.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.