Caldwell, ID ZIP Codes, Area Codes and Address Format

City guides  |  August 24, 2026  |  2 min read

Caldwell is one of the busiest mail areas in Idaho, with 2 standard ZIP codes in Canyon County. Here is everything you need to format a Caldwell address correctly.

State

Idaho (ID)

County

Canyon County

Standard ZIP codes

2

Time zone

Mountain

Caldwell ZIP codes

These are the standard delivery ZIP codes for Caldwell. The city has 3 ZIP codes in total when PO Box and unique codes are included.

• 83605
• 83607

Area codes in Caldwell

Caldwell phone numbers use 208 and 986. With more than one code in use, residents on the same street can have different area codes.

Sample Caldwell addresses

The street lines are invented; the city, state and ZIP codes are real. Use them for form testing, mockups and training materials, never for real orders.

How to write an address in Caldwell

• End the address with CALDWELL, ID and the five-digit ZIP code.
• Put apartment or suite numbers at the end of the street line.
• Use USPS abbreviations such as ST, AVE and BLVD.
• Match the ZIP code to the street. Caldwell has 2 codes, so the city name alone is not enough.

Other cities in Canyon County

Nampa

More Idaho cities

Aberdeen, Arimo, Albion, Arco, Ashton, or see all Idaho cities.