| Campbell to Oakley (California) | 51.24 mi (82.46 km) |
| Campbell to Oakton (Virginia) | 2,406.47 mi (3,872.84 km) |
| Campbell to Oakville (Missouri) | 1,718.95 mi (2,766.38 km) |
| Campbell to Oatfield (Oregon) | 562.86 mi (905.84 km) |
| Campbell to Ocala (Florida) | 2,349.30 mi (3,780.84 km) |
| Campbell to Ocean Acres (New Jersey) | 2,552.54 mi (4,107.91 km) |
| Campbell to Ocean City (New Jersey) | 2,542.64 mi (4,091.98 km) |
| Campbell to Ocean Pines (Maryland) | 2,527.44 mi (4,067.52 km) |
| Campbell to Ocean Pointe (Hawaii) | 2,417.33 mi (3,890.31 km) |
| Campbell to Ocean Springs (Mississippi) | 1,950.89 mi (3,139.65 km) |
| Campbell to Oceanside (California) | 383.59 mi (617.32 km) |
| Campbell to Oceanside (New York) | 2,573.72 mi (4,142.00 km) |
| Campbell to Ocoee (Florida) | 2,400.57 mi (3,863.34 km) |
| Campbell to Oconomowoc (Wisconsin) | 1,798.48 mi (2,894.38 km) |
| Campbell to Odenton (Maryland) | 2,435.95 mi (3,920.28 km) |
