| Havre de Grace to Odessa (Texas) | 1,557.15 mi (2,505.99 km) |
| Havre de Grace to Ogden (Utah) | 1,877.03 mi (3,020.79 km) |
| Havre de Grace to Oildale (California) | 2,347.65 mi (3,778.18 km) |
| Havre de Grace to Ojus (Florida) | 967.77 mi (1,557.48 km) |
| Havre de Grace to Okemos (Michigan) | 483.59 mi (778.26 km) |
| Havre de Grace to Oklahoma City (Oklahoma) | 1,203.13 mi (1,936.26 km) |
| Havre de Grace to Okmulgee (Oklahoma) | 1,120.07 mi (1,802.57 km) |
| Havre de Grace to Olathe (Kansas) | 1,000.58 mi (1,610.28 km) |
| Havre de Grace to Old Jamestown (Missouri) | 759.57 mi (1,222.42 km) |
| Havre de Grace to Oldsmar (Florida) | 878.38 mi (1,413.62 km) |
| Havre de Grace to Olean (New York) | 212.91 mi (342.64 km) |
| Havre de Grace to Olive Branch (Mississippi) | 817.89 mi (1,316.27 km) |
| Havre de Grace to Olivehurst (California) | 2,402.92 mi (3,867.12 km) |
| Havre de Grace to Olney (Maryland) | 58.17 mi (93.61 km) |
| Havre de Grace to Olympia (Washington) | 2,371.84 mi (3,817.10 km) |
