| Buffalo Grove to Oakley (California) | 1,794.59 mi (2,888.11 km) |
| Buffalo Grove to Oakton (Virginia) | 603.38 mi (971.05 km) |
| Buffalo Grove to Oakville (Missouri) | 285.43 mi (459.36 km) |
| Buffalo Grove to Oatfield (Oregon) | 1,728.30 mi (2,781.42 km) |
| Buffalo Grove to Ocala (Florida) | 954.28 mi (1,535.77 km) |
| Buffalo Grove to Ocean Acres (New Jersey) | 732.40 mi (1,178.68 km) |
| Buffalo Grove to Ocean City (New Jersey) | 726.85 mi (1,169.74 km) |
| Buffalo Grove to Ocean Pines (Maryland) | 723.30 mi (1,164.03 km) |
| Buffalo Grove to Ocean Pointe (Hawaii) | 4,239.11 mi (6,822.18 km) |
| Buffalo Grove to Ocean Springs (Mississippi) | 813.77 mi (1,309.64 km) |
| Buffalo Grove to Oceanside (California) | 1,708.80 mi (2,750.05 km) |
| Buffalo Grove to Oceanside (New York) | 749.06 mi (1,205.49 km) |
| Buffalo Grove to Ocoee (Florida) | 1,005.47 mi (1,618.15 km) |
| Buffalo Grove to Oconomowoc (Wisconsin) | 69.87 mi (112.45 km) |
| Buffalo Grove to Odenton (Maryland) | 628.01 mi (1,010.69 km) |
