| Summit to Oskaloosa (Iowa) | 952.01 mi (1,532.11 km) |
| Summit to Oswego (Illinois) | 728.66 mi (1,172.66 km) |
| Summit to Oswego (New York) | 218.47 mi (351.59 km) |
| Summit to Otsego (Minnesota) | 1,019.77 mi (1,641.16 km) |
| Summit to Ottawa (Illinois) | 754.11 mi (1,213.62 km) |
| Summit to Ottawa (Kansas) | 1,118.55 mi (1,800.13 km) |
| Summit to Ottumwa (Iowa) | 941.87 mi (1,515.79 km) |
| Summit to Overland (Missouri) | 860.82 mi (1,385.36 km) |
| Summit to Overland Park (Kansas) | 1,083.67 mi (1,744.00 km) |
| Summit to Overlea (Maryland) | 147.25 mi (236.97 km) |
| Summit to Oviedo (Florida) | 918.08 mi (1,477.50 km) |
| Summit to Owasso (Oklahoma) | 1,196.99 mi (1,926.36 km) |
| Summit to Owatonna (Minnesota) | 988.01 mi (1,590.05 km) |
| Summit to Owensboro (Kentucky) | 711.64 mi (1,145.28 km) |
| Summit to Owings Mills (Maryland) | 156.77 mi (252.30 km) |
