Washington County ZIP Codes
Iowa, United States · 8 codes
Washington County in Iowa has 8 ZIP codes, from 52201 to 52621, serving 8 places.
ZIP codes in Washington
Frequently asked questions
What is the ZIP code of Washington?
Washington has 8 ZIP codes, from 52201 to 52621. The table lists the places each one serves.
How many places are listed in Washington County?
8 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.