Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/ID/COUNTY/BOISE

Boise County, ID ZIP codes

Boise County, ID has 6 ZIP codes, in 6 towns: 83622, 83629, 83631, 83637, 83602 and 83666. 1 more crosses into it from a neighbouring county: 83716.

The county seat is Idaho City.

ZIP codes
6
Partly in it
1 more
Towns
6
County seat
Idaho City
County FIPS
16015
State
Idaho
Population
8,273
Median household income
$78,774
Land area
1,899 sq mi
Metro area
Boise City

Boise County ZIP codes by town

Idaho City (county seat)
83631

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

ZIP codes partly in Boise County

This ZIP code lies mostly in a neighbouring county but covers a twentieth or more of Boise County.

Map of Boise County ZIP codes

836028362283629836318363783666

The ZIP codes of Boise County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Boise County in numbers

About 8,273 people live in Boise County, in 3,593 households, the 32nd most populous of Idaho's 44 counties. The median household income is $78,774 a year, about the same as the Idaho median of $77,800 (US: $80,734). The median owner-occupied home is valued at $476,100 (14% above the Idaho median), and median gross rent is $850 a month. The median age is 53.4; 31.2% of adults 25 and over hold a bachelor's degree or higher (31.8% across Idaho); the average commute takes 38 minutes.

Population8,273Boise8,273
Households3,593Boise3,593
Median age53.4Boise53.4Idaho37.3US 38.9
Median household income$78,774Boise$78,774Idaho$77,800US $80,734
Median home value$476,100Boise$476,100Idaho$418,600US $332,700
Median gross rent$850Boise$850Idaho$1,238US $1,413
Bachelor's degree or higher31.2%Boise31.2%Idaho31.8%US 35.7%
Mean commute38.0 minBoise38.0 minIdaho21.6 minUS 26.4 min
Population density4 / sq miBoise4 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Boise County

Largest towns in Boise County
TownZIP codesPopulation
Horseshoe Bend 1 758
Idaho City 1 581
Garden Valley 1 438
Lowman 1 46
Placerville 1 30

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Boise County.

Not sure you are in Boise County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Boise County, with figures

ZIP codes in Boise County
ZIP City Type Population Median income Median home
83602 Banks , ID Standard 0 — —
83622 Garden Valley , ID Standard 2,132 $65,625 $576,800
83629 Horseshoe Bend , ID Standard 1,749 $72,500 $398,000
83631 Idaho City , ID Standard 1,916 $80,714 $409,800
83637 Lowman , ID Standard 226 $46,944 $178,100
83666 Placerville , ID Standard 30 $63,125 $412,500

Cite this page

zipcodes.pro. “Boise County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/id/county/boise

Underlying data is public domain or openly licensed — sources, vintages and licences.