| Buffalo Grove to Olympia Heights (Florida) | 1,215.94 mi (1,956.86 km) |
| Buffalo Grove to Omaha (Nebraska) | 421.81 mi (678.84 km) |
| Buffalo Grove to On Top of the World Designated Place (Florida) | 956.48 mi (1,539.31 km) |
| Buffalo Grove to Onalaska (Wisconsin) | 202.50 mi (325.89 km) |
| Buffalo Grove to Oneida (New York) | 627.89 mi (1,010.49 km) |
| Buffalo Grove to Oneonta (New York) | 658.52 mi (1,059.79 km) |
| Buffalo Grove to Ontario (California) | 1,696.59 mi (2,730.41 km) |
| Buffalo Grove to Ontario (Oregon) | 1,461.87 mi (2,352.65 km) |
| Buffalo Grove to Opa-locka (Florida) | 1,206.18 mi (1,941.16 km) |
| Buffalo Grove to Opelika (Alabama) | 671.87 mi (1,081.26 km) |
| Buffalo Grove to Opelousas (Louisiana) | 836.16 mi (1,345.66 km) |
| Buffalo Grove to Orange (California) | 1,715.18 mi (2,760.32 km) |
| Buffalo Grove to Orange (Texas) | 892.33 mi (1,436.06 km) |
| Buffalo Grove to Orange City (Florida) | 987.43 mi (1,589.11 km) |
| Buffalo Grove to Orangeburg (South Carolina) | 712.92 mi (1,147.33 km) |
