| 231 Area Code Basic Information | |
|---|---|
| Area Code | 231 |
| Location | MI |
| Country | US |
| In Service Date | 1999-06-05 |
| Service Length | 27 years |
| Overlay Area Code? | No |
| Overlay Area Codes | |
| Parent Area Code | 616 |
| Time Zone | E |
| Map | |
| Area code in jeopardy? | No |
The following section explains how to dial outbound numbers from this area code.