| Business | Phone |
| City Substation Highway 39, Mt Vernon 65712 | (417) 466-2791 |
| Mount Vernon City Office Rr 1, Mt Vernon 65712 | (417) 466-7831 |
| Mt Vernon City Collector 319 E Dallas St, Mt Vernon 65712 | (417) 466-2062 |
| Mt Vernon Sewer Treatment Plnt N Highway 39, Mt Vernon 65712 | (417) 466-2781 |