Irwin Idaho ZIP Codes

Irwin holds a single ZIP code.

Every ZIP code in Irwin

The complete list of Irwin, Idaho ZIP codes with the county each falls in.
ZIP code	County
83428	Bonneville 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We do not publish a delivery type (standard, PO box, unique) or a neighbourhood for each ZIP.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 Irwin codes above are listed without a column we would have to invent.

Scope every ZIP code recorded for Irwin. 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 Irwin ZIP code begins 834. Those first three digits identify the sectional center facility that processes mail for this part of Idaho. Statewide that range covers 45 ZIP codes, so Irwin accounts for 2% of it.

Every Idaho ZIP prefix and the region it covers →

Area codes covering Irwin

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

Irwin Idaho area codes in full →

Where Irwin's ZIP codes sit

Each point is one Irwin ZIP code, plotted from its record coordinates.

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

Cities near Irwin

The closest places to Irwin with their own ZIP code list, nearest first.
City	Distance	ZIP codes
Swan Valley Idaho ZIP codes	3.5 mi	1 ZIP code
Victor Idaho ZIP codes	16 mi	1 ZIP code
Driggs Idaho ZIP codes	24 mi	1 ZIP code
Tetonia Idaho ZIP codes	29 mi	1 ZIP code
Ririe Idaho ZIP codes	29 mi	1 ZIP code
Iona Idaho ZIP codes	34 mi	1 ZIP code
Ucon Idaho ZIP codes	37 mi	1 ZIP code
Rigby Idaho ZIP codes	37 mi	1 ZIP code

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