| Buchs to Olympia Heights (Florida) | 4,927.35 mi (7,929.81 km) |
| Buchs to Omaha (Nebraska) | 4,815.94 mi (7,750.51 km) |
| Buchs to On Top of the World Designated Place (Florida) | 4,851.20 mi (7,807.24 km) |
| Buchs to Onalaska (Wisconsin) | 4,512.81 mi (7,262.67 km) |
| Buchs to Oneida (New York) | 3,945.95 mi (6,350.39 km) |
| Buchs to Oneonta (New York) | 3,947.01 mi (6,352.09 km) |
| Buchs to Ontario (California) | 5,937.60 mi (9,555.64 km) |
| Buchs to Ontario (Oregon) | 5,343.23 mi (8,599.10 km) |
| Buchs to Opa-locka (Florida) | 4,915.17 mi (7,910.20 km) |
| Buchs to Opelika (Alabama) | 4,813.71 mi (7,746.92 km) |
| Buchs to Opelousas (Louisiana) | 5,196.69 mi (8,363.27 km) |
| Buchs to Orange (California) | 5,957.97 mi (9,588.42 km) |
| Buchs to Orange (Texas) | 5,285.54 mi (8,506.26 km) |
| Buchs to Orange City (Florida) | 4,815.70 mi (7,750.12 km) |
| Buchs to Orangeburg (South Carolina) | 4,583.36 mi (7,376.21 km) |
