| Knic to Olympia Heights (Florida) | 5,515.56 mi (8,876.44 km) |
| Knic to Omaha (Nebraska) | 5,366.40 mi (8,636.39 km) |
| Knic to On Top of the World Designated Place (Florida) | 5,438.34 mi (8,752.17 km) |
| Knic to Onalaska (Wisconsin) | 5,065.99 mi (8,152.92 km) |
| Knic to Oneida (New York) | 4,523.13 mi (7,279.27 km) |
| Knic to Oneonta (New York) | 4,525.84 mi (7,283.63 km) |
| Knic to Ontario (California) | 6,446.49 mi (10,374.63 km) |
| Knic to Ontario (Oregon) | 5,825.83 mi (9,375.77 km) |
| Knic to Opa-locka (Florida) | 5,503.38 mi (8,856.83 km) |
| Knic to Opelika (Alabama) | 5,396.16 mi (8,684.28 km) |
| Knic to Opelousas (Louisiana) | 5,774.66 mi (9,293.41 km) |
| Knic to Orange (California) | 6,466.69 mi (10,407.13 km) |
| Knic to Orange (Texas) | 5,861.90 mi (9,433.81 km) |
| Knic to Orange City (Florida) | 5,403.27 mi (8,695.72 km) |
| Knic to Orangeburg (South Carolina) | 5,168.43 mi (8,317.78 km) |
