Mount Vernon City Area Code List
| Area Codes | Country | State | City | Time Zone | Operating |
|---|---|---|---|---|---|
| 251 | US | Alabama - AL | Mount Vernon | Central | Details |
| 319 | US | Iowa - IA | Mount Vernon | Central | Details |
| 360 | US | Washington - WA | Mount Vernon | Pacific | Details |
| 417 | US | Missouri - MO | Mount Vernon | Central | Details |
| 541 | US | Oregon - OR | Mount Vernon | Mountain / Pacific | Details |
| 605 | US | South Dakota - SD | Mount Vernon | Central / Mountain | Details |
| 606 | US | Kentucky - KY | Mount Vernon | Eastern / Central | Details |
| 618 | US | Illinois - IL | Mount Vernon | Central | Details |
| 740 | US | Ohio - OH | Mount Vernon | Eastern | Details |
| 812 | US | Indiana - IN | Mount Vernon | Eastern / Central | Details |
| 903 | US | Texas - TX | Mount Vernon | Central | Details |
| 912 | US | Georgia - GA | Mount Vernon | Eastern | Details |
| 914 | US | New York - NY | Mount Vernon | Eastern | Details |