| Preakness to Orangeburg (South Carolina) | 630.61 mi (1,014.87 km) |
| Preakness to Orangevale (California) | 2,468.93 mi (3,973.36 km) |
| Preakness to Orchards (Washington) | 2,413.35 mi (3,883.92 km) |
| Preakness to Orcutt (California) | 2,523.59 mi (4,061.32 km) |
| Preakness to Oregon (Ohio) | 480.30 mi (772.97 km) |
| Preakness to Oregon (Wisconsin) | 790.36 mi (1,271.97 km) |
| Preakness to Oregon City (Oregon) | 2,420.52 mi (3,895.45 km) |
| Preakness to Orem (Utah) | 1,950.72 mi (3,139.38 km) |
| Preakness to Orinda (California) | 2,536.57 mi (4,082.22 km) |
| Preakness to Orland Park (Illinois) | 708.96 mi (1,140.96 km) |
| Preakness to Orlando (Florida) | 950.18 mi (1,529.16 km) |
| Preakness to Ormond Beach (Florida) | 892.46 mi (1,436.28 km) |
| Preakness to Oro Valley (Arizona) | 2,102.74 mi (3,384.03 km) |
| Preakness to Oroville (California) | 2,468.61 mi (3,972.85 km) |
| Preakness to Oshkosh (Wisconsin) | 759.92 mi (1,222.97 km) |
