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County ZIP codes · Idaho · FIPS 16045

Gem County, ID ZIP Codes

Gem County, Idaho has 7 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026), all residential. 4 of the residential ones lie mainly in Gem County and 3 mainly in a neighboring county; 5 cross the county line. Median household income ranges from $65,291 in 83617 (Emmett) to $125,203 in 83616 (Eagle) (Census Bureau, ACS 2020-2024).

  • ACS2020-24
  • Census2020

Where are the ZIP codes of Gem County?

83607 · Caldwell: $85k83616 · Eagle: $125k83617 · Emmett: $65k83629 · Horseshoe Bend: $73k83636 · Letha: $86k83657 · Ola: $51k83670 · Sweet: $92k83607836178365783629836168367083607 · Caldwell: $85k83616 · Eagle: $125k83617 · Emmett: $65k83629 · Horseshoe Bend: $73k83636 · Letha: $86k83657 · Ola: $51k83670 · Sweet: $92k83607836178365783629836168367083607 · Caldwell: $85k83616 · Eagle: $125k83617 · Emmett: $65k83629 · Horseshoe Bend: $73k83636 · Letha: $86k83657 · Ola: $51k83670 · Sweet: $92k836078361783657836298361683670
The residential ZIP codes of Gem 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 $65,291 and $85,399.

They carry 7 postal town names: Caldwell, Eagle, Emmett, Horseshoe Bend, Sweet, Ola, Letha.

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

All 7 residential ZIP codes in Gem County

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

Residential ZIP codes mainly in Gem County, largest first; "In this county" is the share of the ZIP's land in the county
In this county
83617 Emmett 19,058 85 $65k $429k 100%
83670 Sweet 752 11 $92k $506k 69%
83657 Ola 156 1 $51k $606k 98%
83636 Letha 109 44 $86k – 100%

Partly in Gem County

Residential ZIP codes mainly in another county that reach at least 1% into Gem County, by their share here
In this county
83616 Eagle 35,413 318 $125k $799k 36%
83607 Caldwell 35,491 154 $85k $427k 10%
83629 Horseshoe Bend 1,749 9 $73k $398k 5%

Download the 7 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?

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

Share of each ZIP code's land in Gem County and in the neighboring counties
ZIPIn GemElsewhere
8360710%Canyon County70%; Payette County20%
8361636%Ada County64%
836295%Boise County95%
8367069%Boise County31%
8365798%Valley County3%

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

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

Three-digit prefixes of Gem 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 Gem County's
PrefixSectional centerHereAll codes
836Boise, ID (SCF 836)758

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