| Buffalo Grove to Orangevale (California) | 1,754.47 mi (2,823.54 km) |
| Buffalo Grove to Orchards (Washington) | 1,723.67 mi (2,773.99 km) |
| Buffalo Grove to Orcutt (California) | 1,813.58 mi (2,918.67 km) |
| Buffalo Grove to Oregon (Ohio) | 235.57 mi (379.12 km) |
| Buffalo Grove to Oregon (Wisconsin) | 89.57 mi (144.15 km) |
| Buffalo Grove to Oregon City (Oregon) | 1,728.65 mi (2,782.00 km) |
| Buffalo Grove to Orem (Utah) | 1,236.16 mi (1,989.40 km) |
| Buffalo Grove to Orinda (California) | 1,822.01 mi (2,932.24 km) |
| Buffalo Grove to Orland Park (Illinois) | 39.03 mi (62.81 km) |
| Buffalo Grove to Orlando (Florida) | 1,016.11 mi (1,635.27 km) |
| Buffalo Grove to Ormond Beach (Florida) | 967.98 mi (1,557.82 km) |
| Buffalo Grove to Oro Valley (Arizona) | 1,426.64 mi (2,295.96 km) |
| Buffalo Grove to Oroville (California) | 1,754.83 mi (2,824.12 km) |
| Buffalo Grove to Oshkosh (Wisconsin) | 131.71 mi (211.97 km) |
| Buffalo Grove to Oskaloosa (Iowa) | 248.69 mi (400.23 km) |
