| Harmanli to Odessa (Texas) | 6,369.27 mi (10,250.34 km) |
| Harmanli to Ogden (Utah) | 6,117.45 mi (9,845.09 km) |
| Harmanli to Oildale (California) | 6,649.70 mi (10,701.66 km) |
| Harmanli to Ojus (Florida) | 5,792.24 mi (9,321.71 km) |
| Harmanli to Okemos (Michigan) | 5,162.97 mi (8,308.99 km) |
| Harmanli to Oklahoma City (Oklahoma) | 6,004.09 mi (9,662.65 km) |
| Harmanli to Okmulgee (Oklahoma) | 5,943.09 mi (9,564.48 km) |
| Harmanli to Olathe (Kansas) | 5,727.56 mi (9,217.62 km) |
| Harmanli to Old Jamestown (Missouri) | 5,568.60 mi (8,961.80 km) |
| Harmanli to Oldsmar (Florida) | 5,801.28 mi (9,336.25 km) |
| Harmanli to Olean (New York) | 4,965.67 mi (7,991.47 km) |
| Harmanli to Olive Branch (Mississippi) | 5,749.83 mi (9,253.45 km) |
| Harmanli to Olivehurst (California) | 6,478.04 mi (10,425.39 km) |
| Harmanli to Olney (Maryland) | 5,043.79 mi (8,117.20 km) |
| Harmanli to Olympia (Washington) | 5,998.75 mi (9,654.06 km) |
