ZIP Code 83321

83321 is one of Idaho's ZIP codes, delivering to addresses in Castleford, Twin Falls County.

City: Castleford
County: Twin Falls County
State: Idaho
Prefix: 833xx

Where this code sits

83321 is part of the 833xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Castleford.

Castleford Idaho ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 83321 delivers to without sharing its boundary.

ZIP codes nearest 83321

The ZIP codes whose reference points sit closest to 83321.
ZIP code	Distance	Delivers to
ZIP code 83316	7.2 mi	Buhl, ID
ZIP code 83328	14 mi	Filer, ID
ZIP code 83355	18 mi	Wendell, ID
ZIP code 83332	20 mi	Hagerman, ID
ZIP code 83301	21 mi	Twin Falls, ID
ZIP code 83303	21 mi	Twin Falls, ID
ZIP code 83338	23 mi	Jerome, ID
ZIP code 83302	25 mi	Rogerson, 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 83321, plotted from its record coordinates.

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

Scope ZIP code 83321. 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.