Casper, WY ZIP Codes
Casper, Wyoming has 5 ZIP codes: 3 for street addresses (, and ) and 2 for PO boxes ( and ).
Your street decides which one you use.
Which Casper 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?
Casper ZIP code map
Tap or point to an area to see its ZIP code.Full-size map
82602 and 82605 have no area on the map: they are PO box or single-organization ZIP codes. Dashed line: Casper city limits.
Map: Census Bureau ZIP Code Tabulation Areas (2020) and place limits (2024).
All Casper ZIP codes by type
| ZIP | Type and post office or station |
|---|---|
| 82601 | street delivery Casper |
| 82602 | PO boxes at the Downtown Casper post office Downtown Casper |
| 82604 | street delivery Casper |
| 82605 | PO boxes at the Casper post office Casper |
| 82609 | street delivery Casper |
Why your mail may say Casper when you live outside it
Casper ZIP codes also cover Casper Mountain, Antelope Hills and Homa Hills, so a letter addressed to Casper can go to a home outside the city limits.
A ZIP code does not set your city, school district or tax. Natrona County property records show which city you are in.
Casper ZIP code questions
What is the main ZIP code for Casper?
82601, the ZIP code of the main Casper post office at 411 N Forest Dr.
Which Casper ZIP codes are for PO boxes only?
82602 and 82605. Mail to them goes to boxes at the post office, not to street addresses.
What county is Casper in?
Natrona County.
ZIP codes for towns near Casper
More towns near Casper: Loveland, Greeley, Longmont, Boulder, Erie, Lafayette, Broomfield, Brighton, Northglenn.
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