| Keene to Olympia Heights (Florida) | 1,273.93 mi (2,050.20 km) |
| Keene to Omaha (Nebraska) | 1,219.08 mi (1,961.92 km) |
| Keene to On Top of the World Designated Place (Florida) | 1,105.49 mi (1,779.11 km) |
| Keene to Onalaska (Wisconsin) | 949.03 mi (1,527.32 km) |
| Keene to Oneida (New York) | 170.09 mi (273.73 km) |
| Keene to Oneonta (New York) | 144.57 mi (232.66 km) |
| Keene to Ontario (California) | 2,494.33 mi (4,014.24 km) |
| Keene to Ontario (Oregon) | 2,213.04 mi (3,561.55 km) |
| Keene to Opa-locka (Florida) | 1,260.76 mi (2,029.00 km) |
| Keene to Opelika (Alabama) | 1,005.11 mi (1,617.57 km) |
| Keene to Opelousas (Louisiana) | 1,385.55 mi (2,229.83 km) |
| Keene to Orange (California) | 2,512.89 mi (4,044.11 km) |
| Keene to Orange (Texas) | 1,477.57 mi (2,377.91 km) |
| Keene to Orange City (Florida) | 1,089.49 mi (1,753.37 km) |
| Keene to Orangeburg (South Carolina) | 801.01 mi (1,289.11 km) |
