| Business | Phone |
| Aaup 814 Oakland Dr, Kalamazoo 49008 | (269) 345-0151 |
| Afscme 1210 Oakland Dr, Kalamazoo 49008 | (269) 343-1649 |
| Afscme 3625 Douglas Ave, Kalamazoo 49004 | (269) 349-6402 |
| United Steelworkers Of America 615 Luella Ct, Kalamazoo 49001 | (269) 381-5312 |
| Utility Workers Local 606 Bryant St, Kalamazoo 49001 | (269) 381-1454 |
| Amalgamated Transit Union 436 N Park St, Kalamazoo 49007 | (269) 343-1999 |
| Uaw 3731 Covington Rd, Kalamazoo 49001 | (269) 381-2703 |
| Teamsters Local 7 3330 Miller Rd, Kalamazoo 49001 | (269) 343-1269 |
| Bricklayers & Allied 3030 S 9th St, Kalamazoo 49009 | (269) 372-6179 |
| Southwest Michigan Area 3030 S 9th St, Kalamazoo 49009 | (269) 353-1888 |
| Carpenter's Union Local 3617 Gembrit Cir, Kalamazoo 49001 | (269) 345-8601 |
| Communications Workers-America 3530 Douglas Ave, Kalamazoo 49004 | (269) 349-1048 |
| Pace 718 Shoppers Ln, Kalamazoo 49004 | (269) 343-5031 |
| Graphic Communications Intl 606 Bryant St B, Kalamazoo 49001 | (269) 344-3580 |
| Millwrights Local 3617 Gembrit Cir, Kalamazoo 49001 | (269) 383-6163 |
| National Assn-Letter Carriers 3617 Gembrit Cir, Kalamazoo 49001 | (269) 343-9279 |
| International Union-Oper Engrs Pavilion Dr, Kalamazoo 49007 | (269) 349-8660 |