| Preakness to Odenton (Maryland) | 183.88 mi (295.92 km) |
| Preakness to Odessa (Texas) | 1,675.06 mi (2,695.75 km) |
| Preakness to Ogden (Utah) | 1,950.09 mi (3,138.37 km) |
| Preakness to Oildale (California) | 2,436.08 mi (3,920.49 km) |
| Preakness to Ojus (Florida) | 1,089.53 mi (1,753.43 km) |
| Preakness to Okemos (Michigan) | 538.30 mi (866.31 km) |
| Preakness to Oklahoma City (Oklahoma) | 1,315.25 mi (2,116.69 km) |
| Preakness to Okmulgee (Oklahoma) | 1,233.67 mi (1,985.39 km) |
| Preakness to Olathe (Kansas) | 1,098.13 mi (1,767.27 km) |
| Preakness to Old Jamestown (Missouri) | 862.42 mi (1,387.93 km) |
| Preakness to Oldsmar (Florida) | 1,010.79 mi (1,626.71 km) |
| Preakness to Olean (New York) | 231.58 mi (372.69 km) |
| Preakness to Olive Branch (Mississippi) | 944.20 mi (1,519.54 km) |
| Preakness to Olivehurst (California) | 2,477.35 mi (3,986.91 km) |
| Preakness to Olney (Maryland) | 194.94 mi (313.72 km) |
