| Area Code | 517 |
| State | Michigan |
| Current Time in Area Code 517 | 517> EST |
| Timezone | Eastern Standard Time |
| Regional Market Area | Grand Rapids-Kalamazoo-Battle Creek Area Lansing Area Metro Detroit Metro Toledo |
| Metro Area(s) | Adrian, MI Coldwater, MI Hillsdale, MI Jackson, MI Lansing-East Lansing, MI |
| Population (2020) | 938338 |
| Adjacent Area Codes | 260,269,419,567,616,734,810,989 |
| Branch County |
| Eaton County |
| Hillsdale County |
| Ingham County |
| Jackson County |
| Lenawee County |
| Livingston County |
| East Lansing |
| Jackson |
| Lansing |