Harper County ZIP Codes
Oklahoma, United States · 4 codes
Harper County in Oklahoma has 4 ZIP codes, from 73834 to 73855, serving 4 places.
ZIP codes in Harper
Frequently asked questions
What is the ZIP code of Harper?
Harper has 4 ZIP codes, from 73834 to 73855. The table lists the places each one serves.
How many places are listed in Harper County?
4 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.