| Comacchio to Odessa (Texas) | 5,738.52 mi (9,235.25 km) |
| Comacchio to Ogden (Utah) | 5,568.35 mi (8,961.40 km) |
| Comacchio to Oildale (California) | 6,114.86 mi (9,840.92 km) |
| Comacchio to Ojus (Florida) | 5,087.80 mi (8,188.02 km) |
| Comacchio to Okemos (Michigan) | 4,515.31 mi (7,266.69 km) |
| Comacchio to Oklahoma City (Oklahoma) | 5,368.58 mi (8,639.90 km) |
| Comacchio to Okmulgee (Oklahoma) | 5,302.89 mi (8,534.17 km) |
| Comacchio to Olathe (Kansas) | 5,095.98 mi (8,201.18 km) |
| Comacchio to Old Jamestown (Missouri) | 4,922.24 mi (7,921.58 km) |
| Comacchio to Oldsmar (Florida) | 5,104.40 mi (8,214.74 km) |
| Comacchio to Olean (New York) | 4,300.48 mi (6,920.96 km) |
| Comacchio to Olive Branch (Mississippi) | 5,088.15 mi (8,188.58 km) |
| Comacchio to Olivehurst (California) | 5,973.07 mi (9,612.73 km) |
| Comacchio to Olney (Maryland) | 4,365.15 mi (7,025.03 km) |
| Comacchio to Olympia (Washington) | 5,534.92 mi (8,907.59 km) |
