| Business | Phone |
| Hamlin County 4h Grounds Hayti 57241 | (605) 783-3355 |
| Hamlin County Circuit Ct Clerk 350 4th St, Hayti 57241 | (605) 783-3751 |
| Hamlin County Equalization Dir Courthouse, Hayti 57241 | (605) 783-3331 |
| Hamlin County Extension Agent 300 4th St, Hayti 57241 | (605) 783-3656 |
| Hamlin County Register-Deeds 300 4th St, Hayti 57241 | (605) 783-3206 |
| Hamlin County Veterans Svc 118 Main St, Hayti 57241 | (605) 783-3651 |
| Hamlin County Weed Supervisor 400 Main Ave, Hayti 57241 | (605) 783-3483 |
| Highway Shop Highway 21, Hayti 57241 | (605) 783-3626 |