| Ridge to Odenton (Maryland) | 238.51 mi (383.84 km) |
| Ridge to Odessa (Texas) | 1,743.11 mi (2,805.26 km) |
| Ridge to Ogden (Utah) | 2,018.76 mi (3,248.88 km) |
| Ridge to Oildale (California) | 2,505.99 mi (4,033.00 km) |
| Ridge to Ojus (Florida) | 1,113.92 mi (1,792.68 km) |
| Ridge to Okemos (Michigan) | 606.27 mi (975.69 km) |
| Ridge to Oklahoma City (Oklahoma) | 1,384.26 mi (2,227.75 km) |
| Ridge to Okmulgee (Oklahoma) | 1,302.43 mi (2,096.06 km) |
| Ridge to Olathe (Kansas) | 1,168.21 mi (1,880.06 km) |
| Ridge to Old Jamestown (Missouri) | 932.22 mi (1,500.26 km) |
| Ridge to Oldsmar (Florida) | 1,047.11 mi (1,685.16 km) |
| Ridge to Olean (New York) | 298.44 mi (480.30 km) |
| Ridge to Olive Branch (Mississippi) | 1,009.45 mi (1,624.55 km) |
| Ridge to Olivehurst (California) | 2,546.07 mi (4,097.50 km) |
| Ridge to Olney (Maryland) | 252.81 mi (406.86 km) |
