Post Falls, ID ZIP Codes
Post Falls, Idaho has 2 ZIP codes: for street addresses and for PO boxes.
Mail addressed to Post Falls covers nearby places too.
Where the 83854 ZIP code reaches
Tap or point to an area to see its ZIP code.Full-size map
83877 has no area on the map: it is a PO box or single-organization ZIP code. Dashed line: Post Falls city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
Check an address in Post Falls
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?
Post Falls PO box and business ZIP codes
| ZIP | Type and post office or station |
|---|---|
| 83854 | street delivery Post Falls |
| 83877 | PO boxes at the Post Falls post office Post Falls |
Why your mail may say Post Falls when you live outside it
Post Falls ZIP codes also cover Hauser and State Line, so a letter addressed to Post Falls can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. Kootenai County property records show which city you are in.
Post Falls ZIP code questions
What is the main ZIP code for Post Falls?
83854, the ZIP code of the main Post Falls post office at 405 N Greensferry Rd.
Which Post Falls ZIP codes are for PO boxes only?
83877. Mail to it goes to boxes at the post office, not to street addresses.
What county is Post Falls in?
Kootenai County.
ZIP codes for towns near Post Falls
More towns near Post Falls: Pasco, Richland, Missoula, Kennewick, Wenatchee, Yakima, Sammamish, Issaquah, Butte-Silver Bow.
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