| Business | Phone |
| Sully County Agent 700 Ash Ave, Onida 57564 | (605) 258-2334 |
| Sully County Assessments Dir 700 Ash Ave, Onida 57564 | (605) 258-2522 |
| Sully County Register Of Deeds 700 Ash Ave, Onida 57564 | (605) 258-2331 |
| Sully Weed & Pest Supervisor 201 Cedar Ave, Onida 57564 | (605) 258-2751 |