| Havre de Grace to Orangevale (California) | 2,392.91 mi (3,851.01 km) |
| Havre de Grace to Orchards (Washington) | 2,363.79 mi (3,804.15 km) |
| Havre de Grace to Orcutt (California) | 2,434.85 mi (3,918.51 km) |
| Havre de Grace to Oregon (Ohio) | 410.32 mi (660.35 km) |
| Havre de Grace to Oregon (Wisconsin) | 727.17 mi (1,170.27 km) |
| Havre de Grace to Oregon City (Oregon) | 2,369.62 mi (3,813.54 km) |
| Havre de Grace to Orem (Utah) | 1,873.50 mi (3,015.11 km) |
| Havre de Grace to Orinda (California) | 2,458.71 mi (3,956.92 km) |
| Havre de Grace to Orland Park (Illinois) | 632.14 mi (1,017.32 km) |
| Havre de Grace to Orlando (Florida) | 820.90 mi (1,321.10 km) |
| Havre de Grace to Ormond Beach (Florida) | 762.73 mi (1,227.49 km) |
| Havre de Grace to Oro Valley (Arizona) | 1,996.87 mi (3,213.65 km) |
| Havre de Grace to Oroville (California) | 2,395.61 mi (3,855.36 km) |
| Havre de Grace to Oshkosh (Wisconsin) | 710.91 mi (1,144.10 km) |
| Havre de Grace to Oskaloosa (Iowa) | 876.23 mi (1,410.15 km) |
