Union County ZIP Codes
Illinois, United States · 7 codes
Union County in Illinois has 7 ZIP codes, from 62905 to 62998, serving 7 places.
ZIP codes in Union
Frequently asked questions
What is the ZIP code of Union?
Union has 7 ZIP codes, from 62905 to 62998. The table lists the places each one serves.
How many places are listed in Union County?
7 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.