| Address: | 845 Crinella Drive |
| City: | Petaluma |
| Zipcode: | 94954 |
| Type: | Public |
| Grades: | Kâ6 |
| Students: | 1,902 (2020â2021) |
| Teachers: | 80.0 (FTE) |
| Staff: | 113.8 (FTE) |
| Ratio: | 23.77:1 |
Old Adobe Union School District is a public school district in Sonoma County, California, United States.