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 — CITY/ID/CALDWELL

Caldwell ZIP codes, Idaho

Caldwell, ID has 3 ZIP codes (83605, 83607 and 83606) and area codes 208 and 986. The largest is 83605.

USPS city name
3 ZIP codes
Overlapping the city
2 more
Population
66,516
Area codes
208, 986
State
Idaho

Mail addressed to Caldwell uses the ZIP codes above. 2 more ZIP codes cover part of the city but are addressed as somewhere else; they are listed separately below.

Caldwell in numbers

About 66,516 people live in Caldwell, in 21,573 households, the 5th-largest of Idaho's 232 census places. The median household income is $73,058 a year, 6% below the Idaho median of $77,800 (US: $80,734). The median owner-occupied home is valued at $367,300 (12% below the Idaho median), and median gross rent is $1,264 a month. The median age is 31.5; 19.5% of adults 25 and over hold a bachelor's degree or higher (31.8% across Idaho); the average commute takes 25 minutes.

Population66,516Caldwell66,516
Households21,573Caldwell21,573
Median age31.5Caldwell31.5Idaho37.3US 38.9
Median household income$73,058Caldwell$73,058Idaho$77,800US $80,734
Median home value$367,300Caldwell$367,300Idaho$418,600US $332,700
Median gross rent$1,264Caldwell$1,264Idaho$1,238US $1,413
Bachelor's degree or higher19.5%Caldwell19.5%Idaho31.8%US 35.7%
Mean commute24.6 minCaldwell24.6 minIdaho21.6 minUS 26.4 min
Population density2,646 / sq miCaldwell2,646 / sq mi

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

ZIP codes addressed as Caldwell

ZIP codes with the USPS city name Caldwell
ZIP City Type Population Median income Median home
83605 Caldwell , ID Standard 41,325 $68,427 $346,100
83607 Caldwell , ID Standard 35,491 $85,399 $426,700
83606 Caldwell , ID No street area — — —

Other ZIP codes overlapping Caldwell

These ZIP codes cover part of Caldwell but are addressed as somewhere else.

ZIP codes overlapping Caldwell
ZIP City Type Population Median income Median home
83651 Nampa , ID Standard 38,121 $69,914 $338,900
83687 Nampa , ID Standard 43,135 $76,682 $403,600

Map of Caldwell ZIP codes

836058360783606

The ZIP codes of Caldwell, ID, 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.

Towns near Caldwell

The nearest larger towns are Nampa (110,319 people, 6.4 mi), Meridian (130,138 people, 13 mi) and Boise City (237,242 people, 22 mi).

Towns near Caldwell
TownPopulationDistance
Middleton 10,649 5.0 mi
Nampa 110,319 6.4 mi
Star 14,745 9.5 mi
Meridian 130,138 13.2 mi
Homedale 3,069 14.1 mi
Eagle 32,855 15.2 mi
Kuna 27,158 15.3 mi
Emmett 8,275 17.5 mi
Garden City 12,654 18.3 mi
Hidden Springs 3,378 20.6 mi
Boise City 237,242 21.7 mi
Nyssa, OR 3,240 23.2 mi
Fruitland 6,663 28.7 mi

More nearby: every ZIP code in Canyon County · Idaho ZIP codes

Cite this page

zipcodes.pro. “Caldwell, ID ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/city/id/caldwell

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