| Ridge to Oskaloosa (Iowa) | 1,026.90 mi (1,652.63 km) |
| Ridge to Oswego (Illinois) | 803.03 mi (1,292.35 km) |
| Ridge to Oswego (New York) | 255.39 mi (411.01 km) |
| Ridge to Otsego (Minnesota) | 1,085.50 mi (1,746.94 km) |
| Ridge to Ottawa (Illinois) | 829.19 mi (1,334.44 km) |
| Ridge to Ottawa (Kansas) | 1,196.22 mi (1,925.13 km) |
| Ridge to Ottumwa (Iowa) | 1,017.23 mi (1,637.07 km) |
| Ridge to Overland (Missouri) | 939.10 mi (1,511.33 km) |
| Ridge to Overland Park (Kansas) | 1,161.21 mi (1,868.78 km) |
| Ridge to Overlea (Maryland) | 219.62 mi (353.45 km) |
| Ridge to Oviedo (Florida) | 967.57 mi (1,557.15 km) |
| Ridge to Owasso (Oklahoma) | 1,275.60 mi (2,052.89 km) |
| Ridge to Owatonna (Minnesota) | 1,056.83 mi (1,700.80 km) |
| Ridge to Owensboro (Kentucky) | 790.26 mi (1,271.80 km) |
| Ridge to Owings Mills (Maryland) | 230.83 mi (371.48 km) |
