| Humble to Orangevale (California) | 1,591.06 mi (2,560.56 km) |
| Humble to Orchards (Washington) | 1,826.06 mi (2,938.76 km) |
| Humble to Orcutt (California) | 1,500.97 mi (2,415.58 km) |
| Humble to Oregon (Ohio) | 1,041.22 mi (1,675.68 km) |
| Humble to Oregon (Wisconsin) | 950.75 mi (1,530.08 km) |
| Humble to Oregon City (Oregon) | 1,818.00 mi (2,925.78 km) |
| Humble to Orem (Utah) | 1,166.77 mi (1,877.73 km) |
| Humble to Orinda (California) | 1,629.28 mi (2,622.07 km) |
| Humble to Orland Park (Illinois) | 902.56 mi (1,452.54 km) |
| Humble to Orlando (Florida) | 845.74 mi (1,361.09 km) |
| Humble to Ormond Beach (Florida) | 851.35 mi (1,370.12 km) |
| Humble to Oro Valley (Arizona) | 942.59 mi (1,516.96 km) |
| Humble to Oroville (California) | 1,623.34 mi (2,612.51 km) |
| Humble to Oshkosh (Wisconsin) | 1,036.66 mi (1,668.35 km) |
| Humble to Oskaloosa (Iowa) | 794.44 mi (1,278.53 km) |
