| Business | Phone |
| Transportation Dept 480 State Highway 12, Rio Vista 94571 | (707) 374-2134 |
| Transportation Dept Highway 12, Rio Vista 94571 | (707) 374-2214 |
| Transportation Dept River Rd, Rio Vista 94571 | (707) 374-2214 |
| Transportation Dept State Hwy 84, Rio Vista 94571 | (707) 374-2515 |