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County ZIP codes · Idaho · FIPS 16051

Jefferson County, ID ZIP Codes

Jefferson 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 Jefferson County and 2 mainly in a neighboring county; 6 cross the county line. Median household income ranges from $65,590 in 83443 (Ririe) to $90,833 in 83431 (Lewisville) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Jefferson County?

83402 · Idaho Falls: $75k83425 · Hamer: $81k83431 · Lewisville: $91k83434 · Menan: $83k83435 · Monteview: $74k83442 · Rigby: $88k83443 · Ririe: $66k83444 · Roberts: $88k83450 · Terreton: $70k83442834438340283444834258343583450834348343183402 · Idaho Falls: $75k83425 · Hamer: $81k83431 · Lewisville: $91k83434 · Menan: $83k83435 · Monteview: $74k83442 · Rigby: $88k83443 · Ririe: $66k83444 · Roberts: $88k83450 · Terreton: $70k83442834438340283444834258343583450834348343183402 · Idaho Falls: $75k83425 · Hamer: $81k83431 · Lewisville: $91k83434 · Menan: $83k83435 · Monteview: $74k83442 · Rigby: $88k83443 · Ririe: $66k83444 · Roberts: $88k83450 · Terreton: $70k8344283443834028344483425834358345083434
The residential ZIP codes of Jefferson 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 $70,046 and $88,260.

They carry 9 postal town names.

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

All 9 residential ZIP codes in Jefferson County

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

Residential ZIP codes mainly in Jefferson County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
83442 Rigby 25,609 198 $88k $449k 71%
83434 Menan 1,816 42 $83k $277k 72%
83444 Roberts 1,261 8 $88k $263k 99%
83450 Terreton 1,207 9 $70k $231k 100%
83431 Lewisville 1,045 83 $91k $242k 100%
83425 Hamer 622 5 $81k $227k 93%
83435 Monteview 600 3 $74k $221k 81%

Partly in Jefferson County

Residential ZIP codes mainly in another county that reach at least 1% into Jefferson County, by their share here
In this county
83443 Ririe 1,364 7 $66k $248k 4%
83402 Idaho Falls 29,994 175 $75k $335k 3%

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?

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

Share of each ZIP code's land in Jefferson County and in the neighboring counties
ZIPIn JeffersonElsewhere
834023%Bonneville County 97%
8344271%Bonneville County 29%
8343472%Madison County 28%
834434%Bonneville County 95%; Madison County 1%
8344499%
8342593%Fremont County 7%
8343581%Clark County 19%

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

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

The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Every ZIP code of Jefferson County starts with 834.

Three-digit prefixes of Jefferson 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 Jefferson County's
PrefixSectional centerHereAll codes
834 Pocatello, ID (SCF 832) 9 46

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