| Lombard to Oswego (Illinois) | 21.17 mi (34.06 km) |
| Lombard to Oswego (New York) | 594.62 mi (956.95 km) |
| Lombard to Otsego (Minnesota) | 365.41 mi (588.06 km) |
| Lombard to Ottawa (Illinois) | 55.10 mi (88.68 km) |
| Lombard to Ottawa (Kansas) | 443.99 mi (714.53 km) |
| Lombard to Ottumwa (Iowa) | 235.52 mi (379.03 km) |
| Lombard to Overland (Missouri) | 252.13 mi (405.76 km) |
| Lombard to Overland Park (Kansas) | 407.11 mi (655.18 km) |
| Lombard to Overlea (Maryland) | 626.91 mi (1,008.91 km) |
| Lombard to Oviedo (Florida) | 990.21 mi (1,593.59 km) |
| Lombard to Owasso (Oklahoma) | 569.35 mi (916.28 km) |
| Lombard to Owatonna (Minnesota) | 304.81 mi (490.54 km) |
| Lombard to Owensboro (Kentucky) | 288.39 mi (464.12 km) |
| Lombard to Owings Mills (Maryland) | 612.04 mi (984.99 km) |
| Lombard to Owosso (Michigan) | 210.55 mi (338.85 km) |
