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City ZIP codes · Idaho

Caldwell, ID ZIP Codes

3 ZIP codes use the postal name Caldwell, Idaho (Census 2020 ZCTAs and GeoNames postal codes, October 2026): 2 residential and 1 for PO boxes or a single organization. Median household income runs from $68,427 in 83605 to $85,399 in 83607, 1.2 times as much (Census Bureau, ACS 2020-2024). Caldwell's most populous ZIP code is 83605, with 41,325 people (ACS 2020-2024); 61% of its land is in the city of Caldwell.

  • ACS2020-24
  • Census2020
  • GeoNames2026

Where are Caldwell's ZIP codes?

83605: $68k median household income83607: $85k median household income836078360583605: $68k median household income83607: $85k median household income836078360583605: $68k median household income83607: $85k median household income83607
The 2 residential ZIP codes named Caldwell, shaded by median household income in national fifths (ACS 2020-2024). Select a ZIP to open it. <$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 Caldwell's ZIP codes?

The highest median household income is in 83607 ($85,399), the lowest in 83605 ($68,427). Home values run from $346,100 in 83605 to $426,700 in 83607.

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates (B19013, B25077, B01003).

All 2 residential ZIP codes of Caldwell

Residential ZIP codes with the postal name Caldwell, ID, largest first (ACS 2020-2024); sort by any column
County
83605 Canyon County 41,325 1,678 $68k $346k
83607 Canyon County 35,491 154 $85k $427k

Download the 3 ZIP codes as CSV

Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; 2023 Gazetteer land areas (2020 ZCTAs); town names from simplemaps US ZIP Codes (CC BY 4.0) and GeoNames (CC BY 4.0).

PO Box and single-organization ZIP codes in Caldwell

1 ZIP code named Caldwell has no residential delivery area: post office boxes, or one organization (a large employer, an agency, a university) with its own code. The Census Bureau publishes no figures for them.

Caldwell, ID: ZIP codes without a residential area, for PO boxes or one organization (GeoNames postal codes; USPS does not publish openly which is which)
ZIPCounty
83606Canyon County

Source: GeoNames postal codes (CC BY 4.0); a ZIP code with no Census ZCTA has no residential delivery area.

Which counties do Caldwell's ZIP codes reach?

Caldwell's residential ZIP codes lie in 3 counties: Canyon County (2 ZIP codes mainly there), Payette County (part of a ZIP code), Gem County (part of a ZIP code).

Which first three digits do Caldwell'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 Caldwell starts with 836.

Three-digit prefixes of Caldwell'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 Caldwell's
PrefixSectional centerHereAll codes
836 Boise, ID (SCF 836) 3 58

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