| Business | Phone |
| Culpepper Investigations Po Box 21594, El Sobrante 94820 | (510) 243-9860 |
| E A Stein & Assoc El Sobrante 94803 | (510) 222-2626 |
| State Code Compliance Po Box 20131, El Sobrante 94820 | (510) 222-5364 |
| Timothy Friend & Assoc 3817 San Pablo Dam Rd, El Sobrante 94803 | (510) 222-1122 |