| Business | Phone |
| Bennett County Equalization 202 Main St, Martin 57551 | (605) 685-6991 |
| Bennett County Extension Svc Main St, Martin 57551 | (605) 685-6972 |
| Bennett County Register-Deeds 201 Main St, Martin 57551 | (605) 685-6054 |
| County Board Of Commissioners 202 Main St, Martin 57551 | (605) 685-6634 |