| Howard to Odessa (Texas) | 1,165.77 mi (1,876.12 km) |
| Howard to Ogden (Utah) | 1,225.69 mi (1,972.56 km) |
| Howard to Oildale (California) | 1,742.21 mi (2,803.81 km) |
| Howard to Ojus (Florida) | 1,360.06 mi (2,188.81 km) |
| Howard to Okemos (Michigan) | 224.56 mi (361.40 km) |
| Howard to Oklahoma City (Oklahoma) | 801.37 mi (1,289.68 km) |
| Howard to Okmulgee (Oklahoma) | 746.15 mi (1,200.82 km) |
| Howard to Olathe (Kansas) | 523.77 mi (842.93 km) |
| Howard to Old Jamestown (Missouri) | 411.75 mi (662.65 km) |
| Howard to Oldsmar (Florida) | 1,179.95 mi (1,898.94 km) |
| Howard to Olean (New York) | 514.72 mi (828.37 km) |
| Howard to Olive Branch (Mississippi) | 670.40 mi (1,078.90 km) |
| Howard to Olivehurst (California) | 1,751.21 mi (2,818.31 km) |
| Howard to Olney (Maryland) | 678.86 mi (1,092.51 km) |
| Howard to Olympia (Washington) | 1,671.01 mi (2,689.24 km) |
