ZIP Code 82604

82604 is one of Wyoming's ZIP codes, delivering to addresses in Casper, Natrona County.

City: Casper
County: Natrona County
State: Wyoming
Prefix: 826xx

Where this code sits

82604 is part of the 826xx range, the group of codes handled by one mail processing centre. Casper is served by 5 ZIP codes in total; the full list, with the county each falls in, is on the Casper page.

Casper Wyoming ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 82604 delivers to without sharing its boundary.

307 Area code 307

ZIP codes nearest 82604

The ZIP codes whose reference points sit closest to 82604.
ZIP code	Distance	Delivers to
ZIP code 82644	1.6 mi	Mills, WY
ZIP code 82601	3.9 mi	Casper, WY
ZIP code 82602	4.7 mi	Casper, WY
ZIP code 82605	4.8 mi	Casper, WY
ZIP code 82609	5.6 mi	Casper, WY
ZIP code 82636	12 mi	Evansville, WY
ZIP code 82646	26 mi	Natrona, WY
ZIP code 82637	26 mi	Glenrock, WY

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 82604, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 82604. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.