| Sun Prairie to Orangeburg (South Carolina) | 807.70 mi (1,299.87 km) |
| Sun Prairie to Orangevale (California) | 1,687.45 mi (2,715.69 km) |
| Sun Prairie to Orchards (Washington) | 1,639.74 mi (2,638.91 km) |
| Sun Prairie to Orcutt (California) | 1,757.71 mi (2,828.77 km) |
| Sun Prairie to Oregon (Ohio) | 314.28 mi (505.79 km) |
| Sun Prairie to Oregon (Wisconsin) | 19.38 mi (31.18 km) |
| Sun Prairie to Oregon City (Oregon) | 1,645.38 mi (2,647.99 km) |
| Sun Prairie to Orem (Utah) | 1,171.45 mi (1,885.26 km) |
| Sun Prairie to Orinda (California) | 1,756.36 mi (2,826.59 km) |
| Sun Prairie to Orland Park (Illinois) | 129.46 mi (208.34 km) |
| Sun Prairie to Orlando (Florida) | 1,106.91 mi (1,781.40 km) |
| Sun Prairie to Ormond Beach (Florida) | 1,059.71 mi (1,705.44 km) |
| Sun Prairie to Oro Valley (Arizona) | 1,394.11 mi (2,243.60 km) |
| Sun Prairie to Oroville (California) | 1,685.45 mi (2,712.46 km) |
| Sun Prairie to Oshkosh (Wisconsin) | 67.14 mi (108.06 km) |
