| City: | Caldwell, Idaho |
| County: | Canyon County |
| Timezone: | Mountain (GMT -07:00) |
| Local Time: | 10:10:27 AM |
| Population: | No Population Data |
| Area Codes: | 208 / 986 |
| Classification: | PO Box |
| Coordinates: | 43.6631, -116.6865 |
| Quick Link: |
This ZIP doesn't operate in isolation. Most Caldwell residents receive street delivery through the neighboring 83605 ZIP code, which encompasses the surrounding area. The 83606 designation exists specifically for PO Box service, a common arrangement in Idaho communities where post offices handle both street routes and centralized box service under different ZIP codes.
The single street listing for Arthur St indicates the physical post office location where PO Boxes are housed, rather than a delivery route.
ZIP Code 83606 supports both business and residential activity. According to the Business Census (2024), there are 19 business establishments, employing about 323 people with an annual payroll of $17,781,000.
| # Residential Mailboxes: | 0Source: USPS |
| # Business Mailboxes: | 0Source: USPS |
| Total Delivery Receptacles: | 6,158Source: USPS |
| Single Family Delivery Units: | 0Source: USPS |
| Multi Family Delivery Units: | 0Source: USPS |
| # of Businesses: | 19Source: CBP |
| 1st Quarter Payroll: | $4,195,000Source: CBP |
| Annual Payroll: | $17,781,000Source: CBP |
| # of Employees: | 323Source: CBP |
ZIP Code 83606 is located in Canyon County, Idaho, within the Boise City, ID Metropolitan Statistical Area (CBSA 14260) and Idaho's 1st Congressional District. This Metro area has a population of 616,561 people, about 0.00% of whom live in ZIP Code 83606. It covers 0 sq mi of land and a water area of 0 sq mi.
| CBSA Name: | Boise City, IDSource: Census |
| CBSA Number: | 14260Source: Census |
| CBSA Type: | MetroSource: Census |
| CBSA Division: | --Source: Census |
| CBSA Population: | 616,561Source: Census |
| MSA: | Boise City, ID MSASource: Census |
| Land Area: | --Source: Census |
| Water Area: | --Source: Census |
| Congressional District: | 01Source: USPS |
| Congressional Land Area: | 39418.02 sq miSource: Census |
| PMSA: | --Source: Census |
| Intro Date: | < 2004-10Source: ZIP-Codes.com |
| Place FIPS Code: | 1612250Source: Census |
| Place Name: | Caldwell city; IdahoSource: Census |
We could not locate which school district 83606 belongs to, but we will update this once new district data is released. There are no public schools nor private schools with a mailing address in this ZIP Code. Listing Nearby schools instead. It also has 6 colleges, universities or post secondary education institutions nearby which would be a short commute to.
Our sources include trusted federal and licensed data from the United States Postal Service, U.S. Census Bureau, U.S. Geological Survey, Centers for Medicare & Medicaid Services, and the National Center for Education Statistics, along with proprietary datasets created by ZIP-Codes.com. Data last updated on February 1, 2026.