| Business | Phone |
| A & J Electric Svc Inc 4375 Circle Ave, Castro Valley 94546 | (510) 538-2552 |
| Alexander Electric 17034 Foothill Blvd, Castro Valley 94546 | (925) 833-7673 |
| All American Electric Castro Valley 94546 | (510) 881-8195 |
| All Bay Electric 2572 San Carlos Ave, Castro Valley 94546 | (510) 733-9573 |
| Bleyco Inc 11425 Cull Canyon Rd, Castro Valley 94552 | (510) 538-5228 |
| C & B Electric Po Box 2348, Castro Valley 94546 | (510) 881-1771 |
| C J Electric 18756 E Cavendish Dr # 70, Castro Valley 94552 | (510) 582-3001 |
| Canyon Electric 3069 Grove Way, Castro Valley 94546 | (510) 537-9164 |
| Castro Valley Electrical 5361 Crow Canyon Rd, Castro Valley 94552 | (510) 581-6721 |
| Emerald Electric Castro Valley 94546 | (510) 881-0291 |
| Harvey Electric 20835 Chester St # C, Castro Valley 94546 | (510) 538-6501 |
| Home Owner's Electric Castro Valley 94546 | (510) 537-1017 |
| Lightning Electric Castro Valley 94546 | (510) 538-7661 |
| Malfatti Electric Castro Valley 94546 | (510) 881-1893 |
| Quantum Electric Castro Valley 94546 | (510) 538-5634 |
| Rabbott Power Co Castro Valley 94546 | (510) 582-8556 |
| Ran Electric 22469 Eden Canyon Rd, Castro Valley 94552 | (510) 733-6690 |
| Golden Gate Electric Co Castro Valley 94552 | (510) 881-1300 |
| Tryon Electric 18589 W Cavendish Dr, Castro Valley 94552 | (510) 582-7878 |