| Region 1 |
The area west of the Sacramento River
and north of a line starting on Highway 162 from the river (Four
Corners) and proceeding west on Roads 61/60. |
| Region 2 |
That area east of the Sacramento River
and north of Highway 162. |
| Region 3 |
That area west of the Sacramento River,
bounded by Highway 162 and Roads 61/60 on the north, and Highway 20 on
the south. |
| Region 4 |
That area east of the Sacramento River,
bounded by Highway 162 on the north, and Highway 20 on the south. |
| Region 5 |
That area west of the Sacramento
River, bounded by Highway 20 on the north, and Interstate 80 on
the south. |
| Region 6 |
That area east of the Sacramento River,
bounded by Highway 20 on the north, and Interstate 80 on the south. |
| Region 7 |
All the area south of Interstate 80. |
