| Herndon to Orangevale (California) | 2,336.08 mi (3,759.56 km) |
| Herndon to Orchards (Washington) | 2,320.30 mi (3,734.17 km) |
| Herndon to Orcutt (California) | 2,371.97 mi (3,817.31 km) |
| Herndon to Oregon (Ohio) | 368.38 mi (592.85 km) |
| Herndon to Oregon (Wisconsin) | 682.57 mi (1,098.49 km) |
| Herndon to Oregon City (Oregon) | 2,325.44 mi (3,742.43 km) |
| Herndon to Orem (Utah) | 1,816.69 mi (2,923.68 km) |
| Herndon to Orinda (California) | 2,400.94 mi (3,863.94 km) |
| Herndon to Orland Park (Illinois) | 580.93 mi (934.92 km) |
| Herndon to Orlando (Florida) | 759.45 mi (1,222.22 km) |
| Herndon to Ormond Beach (Florida) | 701.00 mi (1,128.15 km) |
| Herndon to Oro Valley (Arizona) | 1,926.69 mi (3,100.71 km) |
| Herndon to Oroville (California) | 2,340.25 mi (3,766.27 km) |
| Herndon to Oshkosh (Wisconsin) | 674.65 mi (1,085.74 km) |
| Herndon to Oskaloosa (Iowa) | 820.48 mi (1,320.44 km) |
