Callao zipcode
| City | Callao |
| ZIP Code | 63534 |
| Type | Standard |
| State Code | MO |
| State | Missouri |
ZIP code of Callao is 63534. This place is located in Missouri state in US. To send any postal service to Callao, you must use 63534 zipcode.
You should avoid following 1 city name of Missouri to be used with the ZIP code 63534.
- Kaseyville, MO