| Humble to Oswego (Illinois) | 895.39 mi (1,440.99 km) |
| Humble to Oswego (New York) | 1,388.54 mi (2,234.65 km) |
| Humble to Otsego (Minnesota) | 1,059.09 mi (1,704.45 km) |
| Humble to Ottawa (Illinois) | 863.67 mi (1,389.95 km) |
| Humble to Ottawa (Kansas) | 594.72 mi (957.11 km) |
| Humble to Ottumwa (Iowa) | 778.43 mi (1,252.77 km) |
| Humble to Overland (Missouri) | 662.85 mi (1,066.75 km) |
| Humble to Overland Park (Kansas) | 615.46 mi (990.48 km) |
| Humble to Overlea (Maryland) | 1,242.82 mi (2,000.13 km) |
| Humble to Oviedo (Florida) | 852.51 mi (1,371.99 km) |
| Humble to Owasso (Oklahoma) | 436.22 mi (702.02 km) |
| Humble to Owatonna (Minnesota) | 980.50 mi (1,577.97 km) |
| Humble to Owensboro (Kentucky) | 710.96 mi (1,144.17 km) |
| Humble to Owings Mills (Maryland) | 1,231.11 mi (1,981.27 km) |
| Humble to Owosso (Michigan) | 1,087.15 mi (1,749.60 km) |
