| Plymouth to Olympia Heights (Florida) | 4,275.19 mi (6,880.26 km) |
| Plymouth to Omaha (Nebraska) | 4,182.22 mi (6,730.63 km) |
| Plymouth to On Top of the World Designated Place (Florida) | 4,195.11 mi (6,751.38 km) |
| Plymouth to Onalaska (Wisconsin) | 3,877.42 mi (6,240.11 km) |
| Plymouth to Oneida (New York) | 3,292.08 mi (5,298.08 km) |
| Plymouth to Oneonta (New York) | 3,292.16 mi (5,298.21 km) |
| Plymouth to Ontario (California) | 5,337.53 mi (8,589.92 km) |
| Plymouth to Ontario (Oregon) | 4,771.93 mi (7,679.68 km) |
| Plymouth to Opa-locka (Florida) | 4,262.90 mi (6,860.47 km) |
| Plymouth to Opelika (Alabama) | 4,157.12 mi (6,690.24 km) |
| Plymouth to Opelousas (Louisiana) | 4,541.88 mi (7,309.45 km) |
| Plymouth to Orange (California) | 5,357.95 mi (8,622.79 km) |
| Plymouth to Orange (Texas) | 4,631.55 mi (7,453.76 km) |
| Plymouth to Orange City (Florida) | 4,160.16 mi (6,695.13 km) |
| Plymouth to Orangeburg (South Carolina) | 3,926.42 mi (6,318.96 km) |
