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County ZIP codes · Idaho · FIPS 16029

Caribou County, ID ZIP Codes

Caribou County, Idaho has 8 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 7 residential and 1 for PO boxes or a single organization. 3 of the residential ones lie mainly in Caribou County and 4 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $64,750 in 83276 (Soda Springs) to $87,743 in 83127 (Thayne) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Caribou County?

83120 · Freedom: $59k83127 · Thayne: $88k83217 · Bancroft: $75k83241 · Grace: $71k83254 · Montpelier: $65k83276 · Soda Springs: $65k83285 · Wayan: –8325483276832178312783285832418312083120 · Freedom: $59k83127 · Thayne: $88k83217 · Bancroft: $75k83241 · Grace: $71k83254 · Montpelier: $65k83276 · Soda Springs: $65k83285 · Wayan: –8325483276832178312783285832418312083120 · Freedom: $59k83127 · Thayne: $88k83217 · Bancroft: $75k83241 · Grace: $71k83254 · Montpelier: $65k83276 · Soda Springs: $65k83285 · Wayan: –83254832768321783127832858324183120
The residential ZIP codes of Caribou County (whole outlines, including the parts in neighboring counties), shaded by median household income in national fifths (ACS 2020-2024).<$54.1k$98.1k+no figure

Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).

How different are its ZIP codes?

The middle half of its ranked ZIP codes (1,000+ people living in households) report median household incomes between $64,750 and $71,298.

They carry 7 postal town names: Soda Springs, Thayne, Montpelier, Grace, Bancroft, Freedom, Wayan.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013).

All 7 residential ZIP codes in Caribou County

3 ZIP codes lie mainly in Caribou County; 4 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Caribou County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
83276 Soda Springs 4,155 6 $65k $253k 96%
83241 Grace 2,488 13 $71k $215k 100%
83217 Bancroft 712 2 $75k $260k 100%

Partly in Caribou County

Residential ZIP codes mainly in another county that reach at least 1% into Caribou County, by their share here
In this county
83127 Thayne 3,812 16 $88k $483k 48%
83285 Wayan 80 0 – – 32%
83120 Freedom 232 2 $59k $526k 19%
83254 Montpelier 3,792 7 $65k $254k 17%

Download the 8 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).

Which ZIP codes cross the county line?

5 ZIP codes of Caribou County extend into another county. A ZIP code follows mail routes, not county borders.

Share of each ZIP code's land in Caribou County and in the neighboring counties
ZIPIn CaribouElsewhere
8327696%Bear Lake County5%
8312748%Lincoln County52%
8325417%Bear Lake County83%
8312019%Bonneville County71%; Lincoln County10%
8328532%Bonneville County68%

Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).

PO Box and single-organization ZIP codes

ZIP codes in Caribou County without a residential area (GeoNames postal codes)
ZIPPostal name
83230Conda

Source: GeoNames postal codes (CC BY 4.0).

Which first three digits do Caribou County's ZIP codes use?

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Caribou County's ZIP codes use 2 prefixes: 831 and 832.

Three-digit prefixes of Caribou County's ZIP codes, the sectional center for each (USPS labeling list L005, effective October 1, 2026) and how many of the prefix's codes are Caribou County's
PrefixSectional centerHereAll codes
831Salt Lake City, UT (SCF 840)218
832Pocatello, ID (SCF 832)657

Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.