| Serris to Olympia Heights (Florida) | 4,598.75 mi (7,400.98 km) |
| Serris to Omaha (Nebraska) | 4,499.62 mi (7,241.44 km) |
| Serris to On Top of the World Designated Place (Florida) | 4,521.30 mi (7,276.33 km) |
| Serris to Onalaska (Wisconsin) | 4,195.52 mi (6,752.03 km) |
| Serris to Oneida (New York) | 3,618.39 mi (5,823.23 km) |
| Serris to Oneonta (New York) | 3,618.84 mi (5,823.96 km) |
| Serris to Ontario (California) | 5,639.54 mi (9,075.96 km) |
| Serris to Ontario (Oregon) | 5,059.71 mi (8,142.82 km) |
| Serris to Opa-locka (Florida) | 4,586.52 mi (7,381.30 km) |
| Serris to Opelika (Alabama) | 4,484.32 mi (7,216.81 km) |
| Serris to Opelousas (Louisiana) | 4,868.58 mi (7,835.23 km) |
| Serris to Orange (California) | 5,659.95 mi (9,108.81 km) |
| Serris to Orange (Texas) | 4,957.96 mi (7,979.06 km) |
| Serris to Orange City (Florida) | 4,485.94 mi (7,219.43 km) |
| Serris to Orangeburg (South Carolina) | 4,253.46 mi (6,845.28 km) |
