| Keystone to Oakley (California) | 2,345.09 mi (3,774.05 km) |
| Keystone to Oakton (Virginia) | 803.10 mi (1,292.46 km) |
| Keystone to Oakville (Missouri) | 839.99 mi (1,351.83 km) |
| Keystone to Oatfield (Oregon) | 2,480.30 mi (3,991.66 km) |
| Keystone to Ocala (Florida) | 77.28 mi (124.36 km) |
| Keystone to Ocean Acres (New Jersey) | 932.28 mi (1,500.36 km) |
| Keystone to Ocean City (New Jersey) | 895.44 mi (1,441.07 km) |
| Keystone to Ocean Pines (Maryland) | 828.29 mi (1,333.00 km) |
| Keystone to Ocean Pointe (Hawaii) | 4,683.56 mi (7,537.46 km) |
| Keystone to Ocean Springs (Mississippi) | 404.60 mi (651.15 km) |
| Keystone to Oceanside (California) | 2,082.61 mi (3,351.64 km) |
| Keystone to Oceanside (New York) | 1,002.34 mi (1,613.11 km) |
| Keystone to Ocoee (Florida) | 71.88 mi (115.68 km) |
| Keystone to Oconomowoc (Wisconsin) | 1,085.18 mi (1,746.43 km) |
| Keystone to Odenton (Maryland) | 827.95 mi (1,332.46 km) |
