| Summerlin South to Odenton (Maryland) | 2,109.13 mi (3,394.32 km) |
| Summerlin South to Odessa (Texas) | 798.79 mi (1,285.53 km) |
| Summerlin South to Ogden (Utah) | 396.50 mi (638.10 km) |
| Summerlin South to Oildale (California) | 212.78 mi (342.43 km) |
| Summerlin South to Ojus (Florida) | 2,183.55 mi (3,514.09 km) |
| Summerlin South to Okemos (Michigan) | 1,701.36 mi (2,738.07 km) |
| Summerlin South to Oklahoma City (Oklahoma) | 998.23 mi (1,606.50 km) |
| Summerlin South to Okmulgee (Oklahoma) | 1,080.84 mi (1,739.45 km) |
| Summerlin South to Olathe (Kansas) | 1,137.88 mi (1,831.24 km) |
| Summerlin South to Old Jamestown (Missouri) | 1,381.68 mi (2,223.60 km) |
| Summerlin South to Oldsmar (Florida) | 1,981.22 mi (3,188.46 km) |
| Summerlin South to Olean (New York) | 2,004.61 mi (3,226.11 km) |
| Summerlin South to Olive Branch (Mississippi) | 1,430.95 mi (2,302.90 km) |
| Summerlin South to Olivehurst (California) | 397.07 mi (639.03 km) |
| Summerlin South to Olney (Maryland) | 2,088.38 mi (3,360.92 km) |
