| Summit to Orangeburg (South Carolina) | 613.93 mi (988.02 km) |
| Summit to Orangevale (California) | 2,465.04 mi (3,967.09 km) |
| Summit to Orchards (Washington) | 2,413.05 mi (3,883.43 km) |
| Summit to Orcutt (California) | 2,517.85 mi (4,052.10 km) |
| Summit to Oregon (Ohio) | 475.70 mi (765.56 km) |
| Summit to Oregon (Wisconsin) | 787.42 mi (1,267.23 km) |
| Summit to Oregon City (Oregon) | 2,420.04 mi (3,894.68 km) |
| Summit to Orem (Utah) | 1,946.56 mi (3,132.68 km) |
| Summit to Orinda (California) | 2,532.43 mi (4,075.55 km) |
| Summit to Orland Park (Illinois) | 704.06 mi (1,133.08 km) |
| Summit to Orlando (Florida) | 933.13 mi (1,501.72 km) |
| Summit to Ormond Beach (Florida) | 875.42 mi (1,408.85 km) |
| Summit to Oro Valley (Arizona) | 2,094.29 mi (3,370.43 km) |
| Summit to Oroville (California) | 2,465.14 mi (3,967.27 km) |
| Summit to Oshkosh (Wisconsin) | 758.76 mi (1,221.11 km) |
