| Ottawa to Oxford (Alabama) | 559.97 mi (901.18 km) |
| Ottawa to Oxford (Mississippi) | 484.69 mi (780.03 km) |
| Ottawa to Oxford (Ohio) | 249.77 mi (401.97 km) |
| Ottawa to Oxnard (California) | 1,720.00 mi (2,768.07 km) |
| Ottawa to Oxon Hill (Maryland) | 650.73 mi (1,047.25 km) |
| Ottawa to Ozark (Alabama) | 706.66 mi (1,137.27 km) |
| Ottawa to Ozark (Missouri) | 379.75 mi (611.15 km) |
| Ottawa to Pace (Florida) | 747.57 mi (1,203.10 km) |
| Ottawa to Pacific Grove (California) | 1,796.22 mi (2,890.74 km) |
| Ottawa to Pacifica (California) | 1,801.63 mi (2,899.44 km) |
| Ottawa to Paducah (Kentucky) | 296.18 mi (476.66 km) |
| Ottawa to Pahrump (Nevada) | 1,498.96 mi (2,412.34 km) |
| Ottawa to Painesville (Ohio) | 392.32 mi (631.38 km) |
| Ottawa to Palatine (Illinois) | 66.37 mi (106.82 km) |
| Ottawa to Palatka (Florida) | 902.60 mi (1,452.60 km) |
