| Howard to Oswego (Illinois) | 199.85 mi (321.62 km) |
| Howard to Oswego (New York) | 580.71 mi (934.56 km) |
| Howard to Otsego (Minnesota) | 274.61 mi (441.94 km) |
| Howard to Ottawa (Illinois) | 225.19 mi (362.41 km) |
| Howard to Ottawa (Kansas) | 554.10 mi (891.73 km) |
| Howard to Ottumwa (Iowa) | 328.98 mi (529.43 km) |
| Howard to Overland (Missouri) | 422.46 mi (679.89 km) |
| Howard to Overland Park (Kansas) | 519.07 mi (835.37 km) |
| Howard to Overlea (Maryland) | 694.00 mi (1,116.88 km) |
| Howard to Oviedo (Florida) | 1,163.12 mi (1,871.86 km) |
| Howard to Owasso (Oklahoma) | 701.50 mi (1,128.96 km) |
| Howard to Owatonna (Minnesota) | 256.06 mi (412.09 km) |
| Howard to Owensboro (Kentucky) | 473.44 mi (761.92 km) |
| Howard to Owings Mills (Maryland) | 680.16 mi (1,094.60 km) |
| Howard to Owosso (Michigan) | 223.60 mi (359.85 km) |
