Mercer County ZIP Codes
Ohio, United States · 10 codes
Mercer County in Ohio has 10 ZIP codes, from 45310 to 45883, serving 10 places.
ZIP codes in Mercer
Frequently asked questions
What is the ZIP code of Mercer?
Mercer has 10 ZIP codes, from 45310 to 45883. The table lists the places each one serves.
How many places are listed in Mercer County?
10 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.