Franklin County ZIP Codes
Washington, United States · 6 codes
Franklin County in Washington has 6 ZIP codes, from 99301 to 99343, serving 6 places.
ZIP codes in Franklin
Frequently asked questions
What is the ZIP code of Franklin?
Franklin has 6 ZIP codes, from 99301 to 99343. The table lists the places each one serves.
How many places are listed in Franklin County?
6 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.