| Riihimaki to Oswego (Illinois) | 4,428.63 mi (7,127.19 km) |
| Riihimaki to Oswego (New York) | 4,004.18 mi (6,444.10 km) |
| Riihimaki to Otsego (Minnesota) | 4,343.40 mi (6,990.03 km) |
| Riihimaki to Ottawa (Illinois) | 4,460.87 mi (7,179.08 km) |
| Riihimaki to Ottawa (Kansas) | 4,790.05 mi (7,708.84 km) |
| Riihimaki to Ottumwa (Iowa) | 4,571.91 mi (7,357.78 km) |
| Riihimaki to Overland (Missouri) | 4,661.05 mi (7,501.24 km) |
| Riihimaki to Overland Park (Kansas) | 4,758.24 mi (7,657.65 km) |
| Riihimaki to Overlea (Maryland) | 4,239.45 mi (6,822.74 km) |
| Riihimaki to Oviedo (Florida) | 5,010.32 mi (8,063.34 km) |
| Riihimaki to Owasso (Oklahoma) | 4,946.80 mi (7,961.11 km) |
| Riihimaki to Owatonna (Minnesota) | 4,405.30 mi (7,089.64 km) |
| Riihimaki to Owensboro (Kentucky) | 4,631.98 mi (7,454.44 km) |
| Riihimaki to Owings Mills (Maryland) | 4,244.69 mi (6,831.18 km) |
| Riihimaki to Owosso (Michigan) | 4,241.75 mi (6,826.44 km) |
