 | |
| The County of San Diego Flag | |
| Use | Civil and state flag |
|---|---|
| Adopted | February 18, 1957 |
| Designed by | Estelle Secor |
The flag of San Diego County was adopted in February 1957, although an actual specimen would not be created until September 1957. It features the San Diego County seal adopted in 1937, centered on a horizontal tricolor of red, white, and green.