| Business | Phone |
| A Unlimited Investigations 2063 Main St # 222, Oakley 94561 | (925) 684-3934 |
| Bascom Consulting & Invstgtns Po Box 192, Oakley 94561 | (925) 625-1083 |
| Central Point Investigations Oakley 94561 | (925) 625-6434 |
| Martin & Assoc Investigation Oakley 94561 | (925) 625-8470 |