ZIP Code 83121

83121 is one of Wyoming's ZIP codes, delivering to addresses in Frontier, Lincoln County.

City: Frontier
County: Lincoln County
State: Wyoming
Prefix: 831xx

Where this code sits

83121 is part of the 831xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Frontier.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 83121 delivers to without sharing its boundary.

307 Area code 307

ZIP codes nearest 83121

The ZIP codes whose reference points sit closest to 83121.
ZIP code	Distance	Delivers to
ZIP code 83101	1.8 mi	Kemmerer, WY
ZIP code 83116	2.1 mi	Diamondville, WY
ZIP code 83124	14 mi	Opal, WY
ZIP code 83114	26 mi	Cokeville, WY
ZIP code 83123	34 mi	La Barge, WY
ZIP code 84064	35 mi	Randolph, UT
ZIP code 82933	35 mi	Fort Bridger, WY
ZIP code 82937	36 mi	Lyman, 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 83121, plotted from its record coordinates.

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

Scope ZIP code 83121. 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.