ZIP Code 83420

83420 is one of Idaho's ZIP codes, delivering to addresses in Ashton, Fremont County.

City: Ashton
County: Fremont County
State: Idaho
Prefix: 834xx

Where this code sits

83420 is part of the 834xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Ashton.

Ashton Idaho ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 83420 delivers to without sharing its boundary.

ZIP codes nearest 83420

The ZIP codes whose reference points sit closest to 83420.
ZIP code	Distance	Delivers to
ZIP code 83421	5.5 mi	Chester, ID
ZIP code 83436	13 mi	Newdale, ID
ZIP code 83451	14 mi	Teton, ID
ZIP code 83445	14 mi	Saint Anthony, ID
ZIP code 83424	15 mi	Felt, ID
ZIP code 83438	17 mi	Parker, ID
ZIP code 83448	18 mi	Sugar City, ID
ZIP code 83452	19 mi	Tetonia, ID

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 83420, plotted from its record coordinates.

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

Scope ZIP code 83420. 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.