| Ottawa to Oak Grove (South Carolina) | 659.89 mi (1,061.99 km) |
| Ottawa to Oak Harbor (Washington) | 1,709.19 mi (2,750.68 km) |
| Ottawa to Oak Hills (Oregon) | 1,717.32 mi (2,763.76 km) |
| Ottawa to Oak Lawn (Illinois) | 60.78 mi (97.82 km) |
| Ottawa to Oak Park (California) | 1,698.99 mi (2,734.27 km) |
| Ottawa to Oak Park (Illinois) | 64.91 mi (104.47 km) |
| Ottawa to Oak Park (Michigan) | 300.08 mi (482.93 km) |
| Ottawa to Oak Ridge (Florida) | 983.16 mi (1,582.25 km) |
| Ottawa to Oak Ridge (New Jersey) | 744.48 mi (1,198.12 km) |
| Ottawa to Oak Ridge (Tennessee) | 445.45 mi (716.89 km) |
| Ottawa to Oakdale (California) | 1,713.78 mi (2,758.06 km) |
| Ottawa to Oakdale (Minnesota) | 326.18 mi (524.94 km) |
| Ottawa to Oakland (California) | 1,784.12 mi (2,871.26 km) |
| Ottawa to Oakland (New Jersey) | 757.76 mi (1,219.49 km) |
| Ottawa to Oakland Park (Florida) | 1,159.45 mi (1,865.95 km) |
