| Summerlin South to Oskaloosa (Iowa) | 1,270.31 mi (2,044.37 km) |
| Summerlin South to Oswego (Illinois) | 1,494.64 mi (2,405.39 km) |
| Summerlin South to Oswego (New York) | 2,102.61 mi (3,383.82 km) |
| Summerlin South to Otsego (Minnesota) | 1,295.07 mi (2,084.22 km) |
| Summerlin South to Ottawa (Illinois) | 1,467.20 mi (2,361.23 km) |
| Summerlin South to Ottawa (Kansas) | 1,113.00 mi (1,791.21 km) |
| Summerlin South to Ottumwa (Iowa) | 1,278.98 mi (2,058.32 km) |
| Summerlin South to Overland (Missouri) | 1,377.18 mi (2,216.36 km) |
| Summerlin South to Overland Park (Kansas) | 1,145.03 mi (1,842.75 km) |
| Summerlin South to Overlea (Maryland) | 2,116.15 mi (3,405.61 km) |
| Summerlin South to Oviedo (Florida) | 2,046.41 mi (3,293.38 km) |
| Summerlin South to Owasso (Oklahoma) | 1,085.44 mi (1,746.84 km) |
| Summerlin South to Owatonna (Minnesota) | 1,285.74 mi (2,069.21 km) |
| Summerlin South to Owensboro (Kentucky) | 1,556.32 mi (2,504.65 km) |
| Summerlin South to Owings Mills (Maryland) | 2,101.26 mi (3,381.64 km) |
