Amateur Radio Callsigns in ZIP Code: 94820
| Callsign | Name | City | State | Country |
|---|---|---|---|---|
| KD6OKJ | Grazer-Robinson, BARBARA A | EL SOBRANTE | CA | United States |
| N6MNL | Robinson, Robert L | El Sobrante | CA | United States |
| WA6KQB | CONTRA COSTA COMMUNICATIONS CLUB INC | El Sobrante | CA | United States |
| KM6NKS | ROSENBAUM, DAVID L | EL SOBRANTE | CA | United States |
| KN6LAL | Slaymaker, John | El Sobrante | CA | United States |