Knox County ZIP Codes
Illinois, United States · 17 codes
Knox County in Illinois has 17 ZIP codes, from 61401 to 61572, serving 17 places.
ZIP codes in Knox
Frequently asked questions
What is the ZIP code of Knox?
Knox has 17 ZIP codes, from 61401 to 61572. The table lists the places each one serves.
How many places are listed in Knox County?
17 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.