| Placentia to Odenton (Maryland) | 2,295.06 mi (3,693.54 km) |
| Placentia to Odessa (Texas) | 909.64 mi (1,463.93 km) |
| Placentia to Ogden (Utah) | 601.05 mi (967.29 km) |
| Placentia to Oildale (California) | 126.13 mi (202.99 km) |
| Placentia to Ojus (Florida) | 2,309.13 mi (3,716.19 km) |
| Placentia to Okemos (Michigan) | 1,898.77 mi (3,055.77 km) |
| Placentia to Oklahoma City (Oklahoma) | 1,158.99 mi (1,865.22 km) |
| Placentia to Okmulgee (Oklahoma) | 1,243.59 mi (2,001.36 km) |
| Placentia to Olathe (Kansas) | 1,323.16 mi (2,129.41 km) |
| Placentia to Old Jamestown (Missouri) | 1,565.48 mi (2,519.39 km) |
| Placentia to Oldsmar (Florida) | 2,112.56 mi (3,399.83 km) |
| Placentia to Olean (New York) | 2,199.50 mi (3,539.76 km) |
| Placentia to Olive Branch (Mississippi) | 1,592.89 mi (2,563.51 km) |
| Placentia to Olivehurst (California) | 413.80 mi (665.94 km) |
| Placentia to Olney (Maryland) | 2,274.48 mi (3,660.42 km) |
