Waterloo, IA ZIP Codes
Waterloo, Iowa has 4 ZIP codes: 3 for street addresses (, and ) and 1 for PO boxes ().
Your street decides which one you use.
Which Waterloo ZIP code is my address in?
Street ranges from the Census Bureau, 2026. PO box and organization ZIP codes are not found by street. A new street may be missing: address not found?
Waterloo ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
50704 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: Waterloo city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Waterloo ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 50701 | street delivery Waterloo Annex |
| 50702 | street delivery Waterloo Annex |
| 50703 | street delivery Waterloo |
| 50704 | PO boxes at the Waterloo post office Waterloo |
ZIP codes from nearby towns that reach into Waterloo
- 50707, mailing town Evansdale, covers 5 percent of Waterloo
- 50613, mailing town Cedar Falls, covers 2 percent of Waterloo
Why your mail may say Waterloo when you live outside it
Waterloo ZIP codes also cover Washburn, so a letter addressed to Waterloo can go to a home outside the city limits.
The reverse happens too: parts of Waterloo use 50707 and 50613, which mail under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Black Hawk County property records show which city you are in.
Waterloo ZIP code questions
What is the main ZIP code for Waterloo?
50703, the ZIP code of the main Waterloo post office at 300 Sycamore St.
Which Waterloo ZIP codes are for PO boxes only?
50704. Mail to it goes to boxes at the post office, not to street addresses.
What county is Waterloo in?
Black Hawk County.
ZIP codes for towns near Waterloo
More towns near Waterloo: Dubuque, Des Moines, Urbandale, West Des Moines, Rochester, La Crosse, Davenport, Rock Island, Bettendorf.
Sources and last checked
USPS ZIP Locale Detail (October 1, 2026), GeoNames (CC BY 4.0), U.S. Census Bureau, HUD-USPS crosswalk.
Checked October 20, 2026. Sources · How we build our lists · Corrections