| Business | Phone |
| Barrett Business Svc Inc 2380 Salvio St # 300, Concord 94520 | (925) 827-5627 |
| Industrial Service Co 1070 Concord Ave # 112, Concord 94520 | (925) 680-4422 |
| Atwork Personnel Svc 1741 Clayton Rd # C, Concord 94520 | (925) 688-1920 |
| Barrett Business Svc Inc 1000 Burnett Ave # 150, Concord 94520 | (925) 827-5627 |
| Medical Staffing Assoc 2001 Salvio St # 9, Concord 94520 | (925) 687-5570 |
| New World Retail Svc Concord 94518 | (925) 682-6360 |
| System 1 Staffing 1390 Willow Pass Rd, Concord 94520 | (925) 246-0311 |