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County ZIP codes · Idaho · FIPS 16031

Cassia County, ID ZIP Codes

Cassia County, Idaho has 9 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 7 of the residential ones lie mainly in Cassia County and 2 mainly in a neighboring county; 4 cross the county line. Median household income ranges from $60,625 in 83323 (Declo) to $71,282 in 83318 (Burley) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Cassia County?

83211 · American Falls: $66k83311 · Albion: $101k83312 · Almo: $57k83318 · Burley: $71k83323 · Declo: $61k83342 · Malta: $57k83344 · Murtaugh: $65k83346 · Oakley: $70k83350 · Rupert: $62k83342832118334683350833238331883344833118331283211 · American Falls: $66k83311 · Albion: $101k83312 · Almo: $57k83318 · Burley: $71k83323 · Declo: $61k83342 · Malta: $57k83344 · Murtaugh: $65k83346 · Oakley: $70k83350 · Rupert: $62k83342832118334683350833238331883344833118331283211 · American Falls: $66k83311 · Albion: $101k83312 · Almo: $57k83318 · Burley: $71k83323 · Declo: $61k83342 · Malta: $57k83344 · Murtaugh: $65k83346 · Oakley: $70k83350 · Rupert: $62k8334283211833468335083323833188334483312
The residential ZIP codes of Cassia 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 $61,806 and $65,483.

They carry 9 postal town names.

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

All 9 residential ZIP codes in Cassia County

7 ZIP codes lie mainly in Cassia County; 2 more reach into it from a neighboring county and follow the first table.

Residential ZIP codes mainly in Cassia County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
83318 Burley 19,459 77 $71k $277k 100%
83323 Declo 1,984 10 $61k $340k 100%
83346 Oakley 1,451 5 $70k $269k 100%
83344 Murtaugh 1,234 7 $65k $426k 69%
83342 Malta 1,231 1 $57k $224k 65%
83311 Albion 903 10 $101k $294k 100%
83312 Almo 278 3 $57k $436k 100%

Partly in Cassia County

Residential ZIP codes mainly in another county that reach at least 1% into Cassia County, by their share here
In this county
83211 American Falls 6,743 9 $66k $209k 35%
83350 Rupert 12,671 48 $62k $244k 7%

Download the 9 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?

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

Share of each ZIP code's land in Cassia County and in the neighboring counties
ZIPIn CassiaElsewhere
833507%Minidoka County 82%; Blaine County 11%
8321135%Power County 65%
8334469%Twin Falls County 31%
8334265%Oneida County 21%; Box Elder County 13%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Cassia County's ZIP codes use 2 prefixes: 832 and 833.

Three-digit prefixes of Cassia 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 Cassia County's
PrefixSectional centerHereAll codes
832 Pocatello, ID (SCF 832) 1 57
833 Boise, ID (SCF 836) 8 39

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