| Kilmarnock to Olympia Heights (Florida) | 4,224.57 mi (6,798.79 km) |
| Kilmarnock to Omaha (Nebraska) | 3,994.38 mi (6,428.34 km) |
| Kilmarnock to On Top of the World Designated Place (Florida) | 4,119.17 mi (6,629.16 km) |
| Kilmarnock to Onalaska (Wisconsin) | 3,693.46 mi (5,944.05 km) |
| Kilmarnock to Oneida (New York) | 3,166.54 mi (5,096.05 km) |
| Kilmarnock to Oneonta (New York) | 3,172.82 mi (5,106.15 km) |
| Kilmarnock to Ontario (California) | 5,102.26 mi (8,211.29 km) |
| Kilmarnock to Ontario (Oregon) | 4,510.20 mi (7,258.46 km) |
| Kilmarnock to Opa-locka (Florida) | 4,211.84 mi (6,778.30 km) |
| Kilmarnock to Opelika (Alabama) | 4,050.27 mi (6,518.29 km) |
| Kilmarnock to Opelousas (Louisiana) | 4,416.39 mi (7,107.49 km) |
| Kilmarnock to Orange (California) | 5,122.62 mi (8,244.06 km) |
| Kilmarnock to Orange (Texas) | 4,500.72 mi (7,243.21 km) |
| Kilmarnock to Orange City (Florida) | 4,089.63 mi (6,581.63 km) |
| Kilmarnock to Orangeburg (South Carolina) | 3,834.85 mi (6,171.59 km) |
