Caldwell, ID ZIP Codes
Caldwell, Idaho has 3 ZIP codes: 2 for street addresses ( and ) and 1 for PO boxes ().
Your street decides which one you use.
Which Caldwell 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?
Caldwell ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
83606 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: Caldwell city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Caldwell ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 83605 | street delivery Caldwell |
| 83606 | PO boxes at the Caldwell post office Caldwell |
| 83607 | street delivery Caldwell |
ZIP codes from nearby towns that reach into Caldwell
Why your mail may say Caldwell when you live outside it
Caldwell ZIP codes also cover Notus, so a letter addressed to Caldwell can go to a home outside the city limits.
The reverse happens too: parts of Caldwell use 83687 and 83651, which mail under a neighboring town's name.
A ZIP code does not set your city, school district or tax. Canyon County property records show which city you are in.
Caldwell ZIP code questions
What is the main ZIP code for Caldwell?
83605, the ZIP code of the main Caldwell post office at 823 Arthur St.
Which Caldwell ZIP codes are for PO boxes only?
83606. Mail to it goes to boxes at the post office, not to street addresses.
What county is Caldwell in?
Canyon County.
ZIP codes for towns near Caldwell
More towns near Caldwell: Lewiston, Pullman, Kennewick, Pasco, Pocatello, Richland, Redmond, Idaho Falls, Bend.
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