| Hickory to Olympia Heights (Florida) | 694.56 mi (1,117.78 km) |
| Hickory to Omaha (Nebraska) | 881.59 mi (1,418.77 km) |
| Hickory to On Top of the World Designated Place (Florida) | 461.88 mi (743.32 km) |
| Hickory to Onalaska (Wisconsin) | 768.38 mi (1,236.58 km) |
| Hickory to Oneida (New York) | 589.75 mi (949.10 km) |
| Hickory to Oneonta (New York) | 572.09 mi (920.70 km) |
| Hickory to Ontario (California) | 2,048.01 mi (3,295.96 km) |
| Hickory to Ontario (Oregon) | 1,957.91 mi (3,150.96 km) |
| Hickory to Opa-locka (Florida) | 682.90 mi (1,099.01 km) |
| Hickory to Opelika (Alabama) | 314.53 mi (506.18 km) |
| Hickory to Opelousas (Louisiana) | 718.65 mi (1,156.55 km) |
| Hickory to Orange (California) | 2,063.93 mi (3,321.58 km) |
| Hickory to Orange (Texas) | 818.20 mi (1,316.76 km) |
| Hickory to Orange City (Florida) | 470.27 mi (756.82 km) |
| Hickory to Orangeburg (South Carolina) | 157.48 mi (253.43 km) |
