Cass County ZIP Codes
Illinois, United States · 6 codes
Cass County in Illinois has 6 ZIP codes, from 62611 to 62691, serving 6 places.
ZIP codes in Cass
Frequently asked questions
What is the ZIP code of Cass?
Cass has 6 ZIP codes, from 62611 to 62691. The table lists the places each one serves.
How many places are listed in Cass County?
6 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.