| Halstead to Oswego (Illinois) | 3,998.37 mi (6,434.76 km) |
| Halstead to Oswego (New York) | 3,463.24 mi (5,573.54 km) |
| Halstead to Otsego (Minnesota) | 4,020.40 mi (6,470.21 km) |
| Halstead to Ottawa (Illinois) | 4,032.31 mi (6,489.38 km) |
| Halstead to Ottawa (Kansas) | 4,407.33 mi (7,092.91 km) |
| Halstead to Ottumwa (Iowa) | 4,182.20 mi (6,730.60 km) |
| Halstead to Overland (Missouri) | 4,219.20 mi (6,790.15 km) |
| Halstead to Overland Park (Kansas) | 4,371.57 mi (7,035.37 km) |
| Halstead to Overlea (Maryland) | 3,644.45 mi (5,865.18 km) |
| Halstead to Oviedo (Florida) | 4,350.55 mi (7,001.53 km) |
| Halstead to Owasso (Oklahoma) | 4,545.91 mi (7,315.94 km) |
| Halstead to Owatonna (Minnesota) | 4,062.86 mi (6,538.54 km) |
| Halstead to Owensboro (Kentucky) | 4,140.04 mi (6,662.74 km) |
| Halstead to Owings Mills (Maryland) | 3,653.34 mi (5,879.49 km) |
| Halstead to Owosso (Michigan) | 3,780.16 mi (6,083.58 km) |
