| Halstead to Odessa (Texas) | 5,019.46 mi (8,078.03 km) |
| Halstead to Ogden (Utah) | 4,841.99 mi (7,792.43 km) |
| Halstead to Oildale (California) | 5,389.63 mi (8,673.77 km) |
| Halstead to Ojus (Florida) | 4,444.55 mi (7,152.81 km) |
| Halstead to Okemos (Michigan) | 3,802.42 mi (6,119.40 km) |
| Halstead to Oklahoma City (Oklahoma) | 4,650.94 mi (7,484.96 km) |
| Halstead to Okmulgee (Oklahoma) | 4,587.09 mi (7,382.22 km) |
| Halstead to Olathe (Kansas) | 4,376.67 mi (7,043.58 km) |
| Halstead to Old Jamestown (Missouri) | 4,209.01 mi (6,773.74 km) |
| Halstead to Oldsmar (Florida) | 4,442.73 mi (7,149.88 km) |
| Halstead to Olean (New York) | 3,598.97 mi (5,791.98 km) |
| Halstead to Olive Branch (Mississippi) | 4,384.30 mi (7,055.85 km) |
| Halstead to Olivehurst (California) | 5,253.14 mi (8,454.11 km) |
| Halstead to Olney (Maryland) | 3,676.67 mi (5,917.03 km) |
| Halstead to Olympia (Washington) | 4,827.36 mi (7,768.88 km) |
