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County ZIP codes · Idaho · FIPS 16087

Washington County, ID ZIP Codes

Washington County, Idaho has 5 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 3 of the residential ones lie mainly in Washington County and 2 mainly in a neighboring county; 3 cross the county line. Median household income ranges from $51,045 in 83672 (Weiser) to $59,351 in 83661 (Payette) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Washington County?

83610 · Cambridge: $66k83632 · Indian Valley: $52k83645 · Midvale: $65k83661 · Payette: $59k83672 · Weiser: $51k836108367283645836618363283610 · Cambridge: $66k83632 · Indian Valley: $52k83645 · Midvale: $65k83661 · Payette: $59k83672 · Weiser: $51k836108367283645836618363283610 · Cambridge: $66k83632 · Indian Valley: $52k83645 · Midvale: $65k83661 · Payette: $59k83672 · Weiser: $51k8361083672836458366183632
The residential ZIP codes of Washington 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?

They carry 5 postal town names: Payette, Weiser, Cambridge, Midvale, Indian Valley.

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

All 5 residential ZIP codes in Washington County

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

Residential ZIP codes mainly in Washington County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
83672 Weiser 9,176 17 $51k $273k 100%
83610 Cambridge 992 2 $66k $279k 87%
83645 Midvale 970 2 $65k $316k 100%

Partly in Washington County

Residential ZIP codes mainly in another county that reach at least 1% into Washington County, by their share here
In this county
83661 Payette 11,105 38 $59k $302k 21%
83632 Indian Valley 704 5 $52k $275k 4%

Download the 5 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?

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

Share of each ZIP code's land in Washington County and in the neighboring counties
ZIPIn WashingtonElsewhere
8366121%Payette County 79%
8361087%Adams County 13%
836324%Adams County 96%

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

Which first three digits do Washington 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 Washington County starts with 836.

Three-digit prefixes of Washington 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 Washington County's
PrefixSectional centerHereAll codes
836 Boise, ID (SCF 836) 5 58

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