Casper Wyoming ZIP Codes

Casper holds 5 ZIP codes, all inside one county and one postal prefix.

Every ZIP code in Casper

The complete list of Casper, Wyoming ZIP codes with the county each falls in.
ZIP code	County
82601	Natrona County
82602	Natrona County
82604	Natrona County
82605	Natrona County
82609	Natrona County

We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP. USPS delivery-type products are licensed, and no clean-rights source maps ZIP codes to neighbourhoods — so the Casper codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Casper. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. ZIP codes are delivery-route groupings, not areas; the boundaries implied by any ZIP map are approximations.

How these codes cluster

Every Casper ZIP code begins 826. Those first three digits identify the sectional center facility that processes mail for this part of Wyoming. Statewide that range covers 21 ZIP codes, so Casper accounts for 24% of it.

Every Wyoming ZIP prefix and the region it covers →

Area codes covering Casper

ZIP codes and area codes are separate systems — one routes mail, the other routes calls — and they do not share boundaries. The code below serves the same ground Casper occupies.

307 Area code 307

Casper Wyoming area codes in full →

Where Casper's ZIP codes sit

Each point is one Casper ZIP code, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

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

Cities near Casper

The closest places to Casper with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Mills Wyoming ZIP codes	3.6 mi	1 ZIP code
Evansville Wyoming ZIP codes	3.6 mi	1 ZIP code
Mountain View Wyoming ZIP codes	5.3 mi	1 ZIP code
Glenrock Wyoming ZIP codes	23 mi	1 ZIP code
Midwest Wyoming ZIP codes	39 mi	1 ZIP code
Edgerton Wyoming ZIP codes	40 mi	1 ZIP code
Douglas Wyoming ZIP codes	47 mi	1 ZIP code
Kaycee Wyoming ZIP codes	62 mi	1 ZIP code

Straight-line distance between place reference points, not driving distance.