| Darien to Oswego (Illinois) | 18.79 mi (30.25 km) |
| Darien to Oswego (New York) | 595.24 mi (957.95 km) |
| Darien to Otsego (Minnesota) | 372.69 mi (599.78 km) |
| Darien to Ottawa (Illinois) | 51.26 mi (82.49 km) |
| Darien to Ottawa (Kansas) | 441.37 mi (710.31 km) |
| Darien to Ottumwa (Iowa) | 235.36 mi (378.77 km) |
| Darien to Overland (Missouri) | 245.35 mi (394.86 km) |
| Darien to Overland Park (Kansas) | 404.50 mi (650.97 km) |
| Darien to Overlea (Maryland) | 623.38 mi (1,003.24 km) |
| Darien to Oviedo (Florida) | 981.38 mi (1,579.38 km) |
| Darien to Owasso (Oklahoma) | 564.97 mi (909.23 km) |
| Darien to Owatonna (Minnesota) | 311.07 mi (500.62 km) |
| Darien to Owensboro (Kentucky) | 279.30 mi (449.48 km) |
| Darien to Owings Mills (Maryland) | 608.49 mi (979.27 km) |
| Darien to Owosso (Michigan) | 212.62 mi (342.17 km) |
