| Piacenza to Oswego (Illinois) | 4,602.79 mi (7,407.47 km) |
| Piacenza to Oswego (New York) | 4,050.22 mi (6,518.21 km) |
| Piacenza to Otsego (Minnesota) | 4,640.15 mi (7,467.61 km) |
| Piacenza to Ottawa (Illinois) | 4,636.74 mi (7,462.11 km) |
| Piacenza to Ottawa (Kansas) | 5,016.49 mi (8,073.26 km) |
| Piacenza to Ottumwa (Iowa) | 4,791.92 mi (7,711.86 km) |
| Piacenza to Overland (Missouri) | 4,819.48 mi (7,756.20 km) |
| Piacenza to Overland Park (Kansas) | 4,980.36 mi (8,015.12 km) |
| Piacenza to Overlea (Maryland) | 4,214.26 mi (6,782.20 km) |
| Piacenza to Oviedo (Florida) | 4,887.85 mi (7,866.23 km) |
| Piacenza to Owasso (Oklahoma) | 5,150.98 mi (8,289.71 km) |
| Piacenza to Owatonna (Minnesota) | 4,680.06 mi (7,531.84 km) |
| Piacenza to Owensboro (Kentucky) | 4,730.55 mi (7,613.08 km) |
| Piacenza to Owings Mills (Maryland) | 4,224.10 mi (6,798.04 km) |
| Piacenza to Owosso (Michigan) | 4,380.79 mi (7,050.21 km) |
