| Simi Valley to Olympia (Washington) | 908.71 mi (1,462.43 km) |
| Simi Valley to Olympia Heights (Florida) | 2,358.07 mi (3,794.95 km) |
| Simi Valley to Omaha (Nebraska) | 1,325.72 mi (2,133.53 km) |
| Simi Valley to On Top of the World Designated Place (Florida) | 2,161.55 mi (3,478.68 km) |
| Simi Valley to Onalaska (Wisconsin) | 1,609.98 mi (2,591.01 km) |
| Simi Valley to Oneida (New York) | 2,374.76 mi (3,821.80 km) |
| Simi Valley to Oneonta (New York) | 2,405.38 mi (3,871.09 km) |
| Simi Valley to Ontario (California) | 67.19 mi (108.13 km) |
| Simi Valley to Ontario (Oregon) | 680.93 mi (1,095.86 km) |
| Simi Valley to Opa-locka (Florida) | 2,357.97 mi (3,794.79 km) |
| Simi Valley to Opelika (Alabama) | 1,918.18 mi (3,087.01 km) |
| Simi Valley to Opelousas (Louisiana) | 1,572.47 mi (2,530.64 km) |
| Simi Valley to Orange (California) | 61.96 mi (99.72 km) |
| Simi Valley to Orange (Texas) | 1,484.89 mi (2,389.71 km) |
| Simi Valley to Orange City (Florida) | 2,222.42 mi (3,576.65 km) |
