| Keystone to Odessa (Texas) | 1,207.61 mi (1,943.46 km) |
| Keystone to Ogden (Utah) | 1,885.09 mi (3,033.75 km) |
| Keystone to Oildale (California) | 2,185.28 mi (3,516.86 km) |
| Keystone to Ojus (Florida) | 212.39 mi (341.81 km) |
| Keystone to Okemos (Michigan) | 1,012.09 mi (1,628.81 km) |
| Keystone to Oklahoma City (Oklahoma) | 1,010.17 mi (1,625.71 km) |
| Keystone to Okmulgee (Oklahoma) | 939.89 mi (1,512.61 km) |
| Keystone to Olathe (Kansas) | 1,021.56 mi (1,644.04 km) |
| Keystone to Old Jamestown (Missouri) | 861.45 mi (1,386.37 km) |
| Keystone to Oldsmar (Florida) | 7.01 mi (11.28 km) |
| Keystone to Olean (New York) | 991.92 mi (1,596.35 km) |
| Keystone to Olive Branch (Mississippi) | 635.81 mi (1,023.23 km) |
| Keystone to Olivehurst (California) | 2,345.44 mi (3,774.62 km) |
| Keystone to Olney (Maryland) | 824.40 mi (1,326.74 km) |
| Keystone to Olympia (Washington) | 2,524.78 mi (4,063.24 km) |
