| Greensboro to Olympia Heights (Florida) | 717.25 mi (1,154.30 km) |
| Greensboro to Omaha (Nebraska) | 943.34 mi (1,518.16 km) |
| Greensboro to On Top of the World Designated Place (Florida) | 503.66 mi (810.57 km) |
| Greensboro to Onalaska (Wisconsin) | 806.58 mi (1,298.07 km) |
| Greensboro to Oneida (New York) | 530.72 mi (854.11 km) |
| Greensboro to Oneonta (New York) | 507.63 mi (816.95 km) |
| Greensboro to Ontario (California) | 2,127.79 mi (3,424.35 km) |
| Greensboro to Ontario (Oregon) | 2,020.67 mi (3,251.96 km) |
| Greensboro to Opa-locka (Florida) | 704.92 mi (1,134.46 km) |
| Greensboro to Opelika (Alabama) | 395.43 mi (636.39 km) |
| Greensboro to Opelousas (Louisiana) | 804.57 mi (1,294.84 km) |
| Greensboro to Orange (California) | 2,143.94 mi (3,450.33 km) |
| Greensboro to Orange (Texas) | 904.60 mi (1,455.81 km) |
| Greensboro to Orange City (Florida) | 502.01 mi (807.91 km) |
| Greensboro to Orangeburg (South Carolina) | 189.27 mi (304.59 km) |
