| Business | Phone |
| Graphic Communications Union 710 E Commonwealth Ave, Fullerton 92831 | (714) 447-3382 |
| Adjunct Faculty United 305 N Harbor Blvd, Fullerton 92832 | (714) 526-5759 |
| American Federation-Teachers 305 N Harbor Blvd # 313, Fullerton 92832 | (714) 526-7220 |