| Business | Phone |
| Teamsters Joint Council 11472 Schenk Dr, Maryland Heights 63043 | (314) 209-0042 |
| Teamsters Local 600 161 Weldon Pkwy # 201, Maryland Heights 63043 | (314) 388-4400 |
| Graphic Communications 105 Progress Pkwy, Maryland Heights 63043 | (314) 878-4616 |
| Communications Workers-America 2070 Mckelvey Rd, Maryland Heights 63043 | (314) 576-6310 |