| Perth to Olympia Heights (Florida) | 4,261.37 mi (6,858.01 km) |
| Perth to Omaha (Nebraska) | 4,005.72 mi (6,446.59 km) |
| Perth to On Top of the World Designated Place (Florida) | 4,151.92 mi (6,681.87 km) |
| Perth to Onalaska (Wisconsin) | 3,706.00 mi (5,964.24 km) |
| Perth to Oneida (New York) | 3,191.65 mi (5,136.46 km) |
| Perth to Oneonta (New York) | 3,199.08 mi (5,148.42 km) |
| Perth to Ontario (California) | 5,101.47 mi (8,210.03 km) |
| Perth to Ontario (Oregon) | 4,502.99 mi (7,246.87 km) |
| Perth to Opa-locka (Florida) | 4,248.59 mi (6,837.44 km) |
| Perth to Opelika (Alabama) | 4,077.69 mi (6,562.41 km) |
| Perth to Opelousas (Louisiana) | 4,439.97 mi (7,145.44 km) |
| Perth to Orange (California) | 5,121.81 mi (8,242.75 km) |
| Perth to Orange (Texas) | 4,523.20 mi (7,279.39 km) |
| Perth to Orange City (Florida) | 4,123.32 mi (6,635.85 km) |
| Perth to Orangeburg (South Carolina) | 3,865.23 mi (6,220.48 km) |
