| Placentia to Orangeburg (South Carolina) | 2,114.98 mi (3,403.74 km) |
| Placentia to Orangevale (California) | 381.33 mi (613.68 km) |
| Placentia to Orchards (Washington) | 852.40 mi (1,371.80 km) |
| Placentia to Orcutt (California) | 161.52 mi (259.94 km) |
| Placentia to Oregon (Ohio) | 1,941.01 mi (3,123.76 km) |
| Placentia to Oregon (Wisconsin) | 1,653.13 mi (2,660.45 km) |
| Placentia to Oregon City (Oregon) | 830.66 mi (1,336.82 km) |
| Placentia to Orem (Utah) | 557.99 mi (897.99 km) |
| Placentia to Orinda (California) | 367.29 mi (591.10 km) |
| Placentia to Orland Park (Illinois) | 1,713.38 mi (2,757.42 km) |
| Placentia to Orlando (Florida) | 2,179.15 mi (3,507.00 km) |
| Placentia to Ormond Beach (Florida) | 2,174.61 mi (3,499.70 km) |
| Placentia to Oro Valley (Arizona) | 410.40 mi (660.48 km) |
| Placentia to Oroville (California) | 439.15 mi (706.74 km) |
| Placentia to Oshkosh (Wisconsin) | 1,711.06 mi (2,753.68 km) |
