| Smolyan to Odessa (Texas) | 6,345.55 mi (10,212.17 km) |
| Smolyan to Ogden (Utah) | 6,106.67 mi (9,827.74 km) |
| Smolyan to Oildale (California) | 6,641.38 mi (10,688.27 km) |
| Smolyan to Ojus (Florida) | 5,750.13 mi (9,253.94 km) |
| Smolyan to Okemos (Michigan) | 5,135.41 mi (8,264.65 km) |
| Smolyan to Oklahoma City (Oklahoma) | 5,979.29 mi (9,622.74 km) |
| Smolyan to Okmulgee (Oklahoma) | 5,917.37 mi (9,523.09 km) |
| Smolyan to Olathe (Kansas) | 5,703.34 mi (9,178.63 km) |
| Smolyan to Old Jamestown (Missouri) | 5,541.50 mi (8,918.19 km) |
| Smolyan to Oldsmar (Florida) | 5,761.98 mi (9,273.02 km) |
| Smolyan to Olean (New York) | 4,934.41 mi (7,941.17 km) |
| Smolyan to Olive Branch (Mississippi) | 5,719.66 mi (9,204.91 km) |
| Smolyan to Olivehurst (California) | 6,473.62 mi (10,418.28 km) |
| Smolyan to Olney (Maryland) | 5,009.46 mi (8,061.95 km) |
| Smolyan to Olympia (Washington) | 5,999.07 mi (9,654.57 km) |
