| Hammond to Orangevale (California) | 1,781.31 mi (2,866.74 km) |
| Hammond to Orchards (Washington) | 1,759.70 mi (2,831.97 km) |
| Hammond to Orcutt (California) | 1,834.67 mi (2,952.62 km) |
| Hammond to Oregon (Ohio) | 209.59 mi (337.31 km) |
| Hammond to Oregon (Wisconsin) | 132.63 mi (213.45 km) |
| Hammond to Oregon City (Oregon) | 1,764.30 mi (2,839.36 km) |
| Hammond to Orem (Utah) | 1,262.30 mi (2,031.48 km) |
| Hammond to Orinda (California) | 1,848.09 mi (2,974.22 km) |
| Hammond to Orland Park (Illinois) | 19.18 mi (30.86 km) |
| Hammond to Orlando (Florida) | 971.60 mi (1,563.64 km) |
| Hammond to Ormond Beach (Florida) | 923.25 mi (1,485.83 km) |
| Hammond to Oro Valley (Arizona) | 1,436.67 mi (2,312.09 km) |
| Hammond to Oroville (California) | 1,782.91 mi (2,869.31 km) |
| Hammond to Oshkosh (Wisconsin) | 174.86 mi (281.42 km) |
| Hammond to Oskaloosa (Iowa) | 267.56 mi (430.60 km) |
