| Mersin to Olympia Heights (Florida) | 6,394.82 mi (10,291.46 km) |
| Mersin to Omaha (Nebraska) | 6,207.82 mi (9,990.52 km) |
| Mersin to On Top of the World Designated Place (Florida) | 6,318.84 mi (10,169.18 km) |
| Mersin to Onalaska (Wisconsin) | 5,911.78 mi (9,514.10 km) |
| Mersin to Oneida (New York) | 5,396.02 mi (8,684.05 km) |
| Mersin to Oneonta (New York) | 5,400.26 mi (8,690.87 km) |
| Mersin to Ontario (California) | 7,226.26 mi (11,629.54 km) |
| Mersin to Ontario (Oregon) | 6,575.91 mi (10,582.91 km) |
| Mersin to Opa-locka (Florida) | 6,382.70 mi (10,271.96 km) |
| Mersin to Opelika (Alabama) | 6,273.37 mi (10,096.02 km) |
| Mersin to Opelousas (Louisiana) | 6,647.19 mi (10,697.62 km) |
| Mersin to Orange (California) | 7,246.03 mi (11,661.35 km) |
| Mersin to Orange (Texas) | 6,732.60 mi (10,835.08 km) |
| Mersin to Orange City (Florida) | 6,283.80 mi (10,112.80 km) |
| Mersin to Orangeburg (South Carolina) | 6,047.83 mi (9,733.05 km) |
