| Rock Hill to Olympia (Washington) | 2,305.67 mi (3,710.61 km) |
| Rock Hill to Olympia Heights (Florida) | 638.17 mi (1,027.04 km) |
| Rock Hill to Omaha (Nebraska) | 924.69 mi (1,488.14 km) |
| Rock Hill to On Top of the World Designated Place (Florida) | 409.92 mi (659.71 km) |
| Rock Hill to Onalaska (Wisconsin) | 821.87 mi (1,322.68 km) |
| Rock Hill to Oneida (New York) | 631.18 mi (1,015.79 km) |
| Rock Hill to Oneonta (New York) | 610.11 mi (981.88 km) |
| Rock Hill to Ontario (California) | 2,072.53 mi (3,335.42 km) |
| Rock Hill to Ontario (Oregon) | 1,999.13 mi (3,217.28 km) |
| Rock Hill to Opa-locka (Florida) | 626.40 mi (1,008.09 km) |
| Rock Hill to Opelika (Alabama) | 295.38 mi (475.37 km) |
| Rock Hill to Opelousas (Louisiana) | 710.85 mi (1,144.00 km) |
| Rock Hill to Orange (California) | 2,088.11 mi (3,360.48 km) |
| Rock Hill to Orange (Texas) | 812.37 mi (1,307.38 km) |
| Rock Hill to Orange City (Florida) | 415.31 mi (668.38 km) |
