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County ZIP codes · Idaho · FIPS 16033

Clark County, ID ZIP Codes

Clark County, Idaho has 4 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 2 of the residential ones lie mainly in Clark County and 2 mainly in a neighboring county; 2 cross the county line.

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Clark County?

83423 · Dubois: $54k83435 · Monteview: $74k83446 · Spencer: $75k83464 · Leadore: $41k8346483423834358344683423 · Dubois: $54k83435 · Monteview: $74k83446 · Spencer: $75k83464 · Leadore: $41k8346483423834358344683423 · Dubois: $54k83435 · Monteview: $74k83446 · Spencer: $75k83464 · Leadore: $41k834648342383435
The residential ZIP codes of Clark 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).

All 4 residential ZIP codes in Clark County

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

Residential ZIP codes mainly in Clark County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
83423 Dubois 729 1 $54k $212k 100%
83446 Spencer 24 1 $75k – 100%

Partly in Clark County

Residential ZIP codes mainly in another county that reach at least 1% into Clark County, by their share here
In this county
83435 Monteview 600 3 $74k $221k 19%
83464 Leadore 296 0 $41k $216k 11%

Download the 4 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?

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

Share of each ZIP code's land in Clark County and in the neighboring counties
ZIPIn ClarkElsewhere
8343519%Jefferson County81%
8346411%Lemhi County89%

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

Which first three digits do Clark 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 Clark County starts with 834.

Three-digit prefixes of Clark 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 Clark County's
PrefixSectional centerHereAll codes
834Pocatello, ID (SCF 832)446

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