ZIP codes

ZIP codes in Bonneville County, Idaho

Bonneville County has 12 ZIP codes. 7 lie entirely inside it and 5 are shared with neighboring counties, so part of their land and their people are elsewhere. About 130,227 people live in the parts inside it (ACS 2020–2024).

By the All Map Tools Team

ZIP codes: 12; 2 more just touch the border (under 1% of their land)
Entirely inside: 7; 99% or more of their land
Shared with other counties: 5; Most with Jefferson County (3)
Most populated ZIP: 83401; 47,972 people · Idaho Falls
Least populated ZIP: 83285; 80 people
Largest ZIP by land: 83428; 249 sq mi · Irwin

Map of the ZIP codes in Bonneville County

Entirely in the county (99% or more of its land)
Shared, mostly in this county
Shared, mostly in other counties
Neighboring counties

Open in the interactive tool

Each area is a ZIP code with its number where it fits. Hover over one to see its name.

All ZIP codes in Bonneville County

12 ZIP codes in Bonneville County, ID, by number
ZIP code	Main city	Population	Land in the county	Residents in the county
83120	Freedom	232	71%	≈ 108
83285	—	80	68%	≈ 65
83401	Idaho Falls	47,972	99.7%	≈ 47,943
83402	Idaho Falls	29,994	97%	≈ 29,753
83404	Idaho Falls	27,500	100%	27,500
83406	Ammon	19,696	100%	19,696
83427	Iona	2,931	100%	2,931
83428	Irwin	576	100%	576
83442	Rigby	25,609	29%	≈ 184
83443	Swan Valley	1,364	95%	≈ 715
83449	Swan Valley	273	100%	273
83454	Ucon	409	100%	409

They also touch the county with under 1% of their land, so they aren’t counted: 83274 and 83444.

ZIP codes shared with other counties

These 5 ZIP codes have part of their land in another county. The first figure is the share of their land in Bonneville County; then, where the rest lies.

83120 (Freedom): 71% here; 19% in Caribou County and 10% in Lincoln County, WY.
83285: 68% here; 32% in Caribou County.
83402 (Idaho Falls): 97% here; 2.5% in Jefferson County.
83442 (Rigby): 29% here; 71% in Jefferson County.
83443 (Swan Valley): 95% here; 3.6% in Jefferson County and 1.2% in Madison County.

Cities and prefixes

By main city (the city, town or CDP each ZIP shares the most land with), the ones with the most are Idaho Falls (3), Swan Valley (2), Ammon (1), Freedom (1), Iona (1), and Irwin (1); 8 places in all.

They start with 3 different three-digit prefixes, one per USPS sorting center: 831, 832, and 834.

Neighboring counties

Each one with its ZIP codes. Those without a page of their own open in the tool.

Tools for this county

ZIP codes by county or city The same ZIP codes on an interactive map, with the list as CSV or to copy County map with cities Its cities, towns and CDPs with their population ZIP codes in a radius The ZIP codes within 10 miles of its center, or any distance you like

Sources

U.S. Census Bureau, 2020 ZCTA to County, ZCTA to Place and ZCTA to Census Tract Relationship Files (and the 2022 County Subdivision to ZCTA file for Connecticut). Public domain.
U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table B01003 (population of each ZIP code, census tract and Connecticut town). Public domain.
U.S. Census Bureau, Vintage 2025 Population Estimates (county population) and 2025 Gazetteer Files (land area and interior point of each ZIP code). Public domain.
U.S. Census Bureau, Cartographic Boundary Files: ZCTAs 2020 and counties 2025, 1:500,000; county adjacency file 2025. Public domain.

How we count. ZIP codes here are the Census Bureau’s ZIP Code Tabulation Areas (ZCTAs), the areas it draws to match USPS ZIP codes; ZIPs with no area of their own (PO boxes, single buildings) aren’t included. A ZIP can cross county lines: “Land in the county” is the exact share of its land inside, from the Census relationship files. “Residents in the county” is the whole ZIP for those entirely inside; for shared ones it’s an estimate, spreading the people of each census tract over the land it shares with the ZIP. Population: ACS 2020–2024. Methodology.

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