| Howard to Oakley (California) | 1,789.11 mi (2,879.29 km) |
| Howard to Oakton (Virginia) | 680.04 mi (1,094.43 km) |
| Howard to Oakville (Missouri) | 438.38 mi (705.51 km) |
| Howard to Oatfield (Oregon) | 1,673.87 mi (2,693.84 km) |
| Howard to Ocala (Florida) | 1,112.25 mi (1,790.00 km) |
| Howard to Ocean Acres (New Jersey) | 780.79 mi (1,256.56 km) |
| Howard to Ocean City (New Jersey) | 783.01 mi (1,260.13 km) |
| Howard to Ocean Pines (Maryland) | 793.29 mi (1,276.68 km) |
| Howard to Ocean Pointe (Hawaii) | 4,223.92 mi (6,797.73 km) |
| Howard to Ocean Springs (Mississippi) | 979.23 mi (1,575.92 km) |
| Howard to Oceanside (California) | 1,742.80 mi (2,804.77 km) |
| Howard to Oceanside (New York) | 782.62 mi (1,259.51 km) |
| Howard to Ocoee (Florida) | 1,162.25 mi (1,870.46 km) |
| Howard to Oconomowoc (Wisconsin) | 103.57 mi (166.68 km) |
| Howard to Odenton (Maryland) | 698.39 mi (1,123.95 km) |
