| Humble to Odessa (Texas) | 439.26 mi (706.91 km) |
| Humble to Ogden (Utah) | 1,213.94 mi (1,953.65 km) |
| Humble to Oildale (California) | 1,427.82 mi (2,297.85 km) |
| Humble to Ojus (Florida) | 962.06 mi (1,548.29 km) |
| Humble to Okemos (Michigan) | 1,063.96 mi (1,712.28 km) |
| Humble to Oklahoma City (Oklahoma) | 400.21 mi (644.08 km) |
| Humble to Okmulgee (Oklahoma) | 390.77 mi (628.88 km) |
| Humble to Olathe (Kansas) | 614.84 mi (989.50 km) |
| Humble to Old Jamestown (Missouri) | 673.70 mi (1,084.22 km) |
| Humble to Oldsmar (Florida) | 772.31 mi (1,242.92 km) |
| Humble to Olean (New York) | 1,253.63 mi (2,017.52 km) |
| Humble to Olive Branch (Mississippi) | 466.33 mi (750.48 km) |
| Humble to Olivehurst (California) | 1,615.33 mi (2,599.63 km) |
| Humble to Olney (Maryland) | 1,209.59 mi (1,946.65 km) |
| Humble to Olympia (Washington) | 1,885.17 mi (3,033.89 km) |
