| Buffalo Grove to Oswego (Illinois) | 38.62 mi (62.16 km) |
| Buffalo Grove to Oswego (New York) | 587.19 mi (944.98 km) |
| Buffalo Grove to Otsego (Minnesota) | 354.37 mi (570.31 km) |
| Buffalo Grove to Ottawa (Illinois) | 71.65 mi (115.30 km) |
| Buffalo Grove to Ottawa (Kansas) | 456.32 mi (734.38 km) |
| Buffalo Grove to Ottumwa (Iowa) | 243.55 mi (391.96 km) |
| Buffalo Grove to Overland (Missouri) | 271.16 mi (436.38 km) |
| Buffalo Grove to Overland Park (Kansas) | 419.48 mi (675.08 km) |
| Buffalo Grove to Overlea (Maryland) | 628.82 mi (1,011.99 km) |
| Buffalo Grove to Oviedo (Florida) | 1,007.48 mi (1,621.39 km) |
| Buffalo Grove to Owasso (Oklahoma) | 584.69 mi (940.97 km) |
| Buffalo Grove to Owatonna (Minnesota) | 297.03 mi (478.03 km) |
| Buffalo Grove to Owensboro (Kentucky) | 307.96 mi (495.61 km) |
| Buffalo Grove to Owings Mills (Maryland) | 614.03 mi (988.18 km) |
| Buffalo Grove to Owosso (Michigan) | 200.88 mi (323.29 km) |
