| Bay City to Olympia Heights (Florida) | 1,250.49 mi (2,012.47 km) |
| Bay City to Omaha (Nebraska) | 640.23 mi (1,030.35 km) |
| Bay City to On Top of the World Designated Place (Florida) | 1,004.68 mi (1,616.88 km) |
| Bay City to Onalaska (Wisconsin) | 365.81 mi (588.72 km) |
| Bay City to Oneida (New York) | 414.78 mi (667.53 km) |
| Bay City to Oneonta (New York) | 452.25 mi (727.83 km) |
| Bay City to Ontario (California) | 1,915.73 mi (3,083.07 km) |
| Bay City to Ontario (Oregon) | 1,638.91 mi (2,637.57 km) |
| Bay City to Opa-locka (Florida) | 1,239.24 mi (1,994.37 km) |
| Bay City to Opelika (Alabama) | 759.40 mi (1,222.14 km) |
| Bay City to Opelousas (Louisiana) | 1,008.17 mi (1,622.50 km) |
| Bay City to Orange (California) | 1,934.61 mi (3,113.46 km) |
| Bay City to Orange (Texas) | 1,076.93 mi (1,733.15 km) |
| Bay City to Orange City (Florida) | 1,022.75 mi (1,645.97 km) |
| Bay City to Orangeburg (South Carolina) | 716.38 mi (1,152.90 km) |
