| Pikesville to Orangeburg (South Carolina) | 468.45 mi (753.90 km) |
| Pikesville to Orangevale (California) | 2,364.95 mi (3,806.03 km) |
| Pikesville to Orchards (Washington) | 2,340.40 mi (3,766.51 km) |
| Pikesville to Orcutt (California) | 2,405.00 mi (3,870.47 km) |
| Pikesville to Oregon (Ohio) | 386.38 mi (621.81 km) |
| Pikesville to Oregon (Wisconsin) | 702.89 mi (1,131.20 km) |
| Pikesville to Oregon City (Oregon) | 2,345.98 mi (3,775.50 km) |
| Pikesville to Orem (Utah) | 1,845.51 mi (2,970.07 km) |
| Pikesville to Orinda (California) | 2,430.46 mi (3,911.45 km) |
| Pikesville to Orland Park (Illinois) | 605.55 mi (974.54 km) |
| Pikesville to Orlando (Florida) | 799.07 mi (1,285.98 km) |
| Pikesville to Ormond Beach (Florida) | 740.73 mi (1,192.09 km) |
| Pikesville to Oro Valley (Arizona) | 1,964.95 mi (3,162.29 km) |
| Pikesville to Oroville (California) | 2,368.14 mi (3,811.15 km) |
| Pikesville to Oshkosh (Wisconsin) | 689.54 mi (1,109.71 km) |
