| Senec to Oakley (California) | 5,972.16 mi (9,611.26 km) |
| Senec to Oakton (Virginia) | 4,477.82 mi (7,206.35 km) |
| Senec to Oakville (Missouri) | 4,992.03 mi (8,033.89 km) |
| Senec to Oatfield (Oregon) | 5,530.88 mi (8,901.09 km) |
| Senec to Ocala (Florida) | 5,148.34 mi (8,285.46 km) |
| Senec to Ocean Acres (New Jersey) | 4,318.39 mi (6,949.78 km) |
| Senec to Ocean City (New Jersey) | 4,352.97 mi (7,005.42 km) |
| Senec to Ocean Pines (Maryland) | 4,415.62 mi (7,106.25 km) |
| Senec to Ocean Pointe (Hawaii) | 7,624.16 mi (12,269.90 km) |
| Senec to Ocean Springs (Mississippi) | 5,351.41 mi (8,612.26 km) |
| Senec to Oceanside (California) | 6,153.15 mi (9,902.54 km) |
| Senec to Oceanside (New York) | 4,252.38 mi (6,843.55 km) |
| Senec to Ocoee (Florida) | 5,153.06 mi (8,293.05 km) |
| Senec to Oconomowoc (Wisconsin) | 4,691.22 mi (7,549.79 km) |
| Senec to Odenton (Maryland) | 4,445.50 mi (7,154.34 km) |
