Marietta City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 309 | US | Illinois - IL | Marietta | Central | Details |
| 320 | US | Minnesota - MN | Marietta | Central | Details |
| 580 | US | Oklahoma - OK | Marietta | Central | Details |
| 678 | US | Georgia - GA | Marietta | Eastern | Details |
| 717 | US | Pennsylvania - PA | Marietta | Eastern | Details |
| 740 | US | Ohio - OH | Marietta | Eastern | Details |
| 770 | US | Georgia - GA | Marietta | Eastern | Details |