Whiteside County ZIP Codes
Illinois, United States · 12 codes
Whiteside County in Illinois has 12 ZIP codes, from 61037 to 61283, serving 12 places.
ZIP codes in Whiteside
Frequently asked questions
What is the ZIP code of Whiteside?
Whiteside has 12 ZIP codes, from 61037 to 61283. The table lists the places each one serves.
How many places are listed in Whiteside County?
12 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.