| Business | Phone |
| Apw Union 204 Fairforest Way, Greenville 29607 | (864) 987-1627 |
| Communications Workers-America 1622 E North St, Greenville 29607 | (864) 271-0014 |
| International Brotherhood 415 N Main St, Greenville 29601 | (864) 242-1980 |
| Mail Handlers 204 Fairforest Way, Greenville 29607 | (864) 284-0700 |
| Mail Handlers 600 W Washington St, Greenville 29602 | (864) 232-3334 |
| Upper Piedmont Postal Workers 600 W Washington St, Greenville 29602 | (864) 370-3318 |