Post Offices List in Darlington County, South Carolina:
| Darlington Post Office | 115 E Smith Ave, Darlington, SC 29532 |
| Hartsville Post Office | 500 S 4th St, Hartsville, SC 29550 |
| Lamar Post Office | 110 Main St, Lamar, SC 29069 |
| Lydia Post Office | 5179 Indian Branch Rd, Lydia, SC 29079 |
| Society Hill Post Office | 269 S Main St, Society Hill, SC 29593 |