| Placentia to Oskaloosa (Iowa) | 1,466.03 mi (2,359.34 km) |
| Placentia to Oswego (Illinois) | 1,689.90 mi (2,719.64 km) |
| Placentia to Oswego (New York) | 2,300.93 mi (3,703.00 km) |
| Placentia to Otsego (Minnesota) | 1,502.61 mi (2,418.21 km) |
| Placentia to Ottawa (Illinois) | 1,661.45 mi (2,673.85 km) |
| Placentia to Ottawa (Kansas) | 1,296.81 mi (2,087.02 km) |
| Placentia to Ottumwa (Iowa) | 1,473.47 mi (2,371.32 km) |
| Placentia to Overland (Missouri) | 1,560.28 mi (2,511.02 km) |
| Placentia to Overland Park (Kansas) | 1,330.28 mi (2,140.87 km) |
| Placentia to Overlea (Maryland) | 2,303.08 mi (3,706.44 km) |
| Placentia to Oviedo (Florida) | 2,183.67 mi (3,514.28 km) |
| Placentia to Owasso (Oklahoma) | 1,253.54 mi (2,017.37 km) |
| Placentia to Owatonna (Minnesota) | 1,490.67 mi (2,399.01 km) |
| Placentia to Owensboro (Kentucky) | 1,734.88 mi (2,792.01 km) |
| Placentia to Owings Mills (Maryland) | 2,288.28 mi (3,682.63 km) |
