Casper, WY ZIP Codes, Area Codes and Address Format

City guides  |  April 9, 2026  |  2 min read

This guide covers Casper, WY: its ZIP codes, area codes, county and time zone, with sample addresses you can copy for testing.

State

Wyoming (WY)

County

Natrona County

Standard ZIP codes

3

Time zone

Mountain

Casper ZIP codes

These are the standard delivery ZIP codes for Casper. The city has 5 ZIP codes in total when PO Box and unique codes are included.

• 82601
• 82604
• 82609

Area codes in Casper

Casper phone numbers use 307. A single area code keeps local numbers easy to recognize.

Sample Casper addresses

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Casper

• End the address with CASPER, WY and the five-digit ZIP code.
• Put apartment or suite numbers at the end of the street line.
• Use USPS abbreviations such as ST, AVE and BLVD.
• Match the ZIP code to the street. Casper has 3 codes, so the city name alone is not enough.

Other cities in Natrona County

Alcova, Arminto

More Wyoming cities

Aladdin, Arapahoe, Gillette, Arminto, Alta, or see all Wyoming cities.