| Healdsburg to Oswego (Illinois) | 1,823.34 mi (2,934.38 km) |
| Healdsburg to Oswego (New York) | 2,407.81 mi (3,874.99 km) |
| Healdsburg to Otsego (Minnesota) | 1,561.64 mi (2,513.22 km) |
| Healdsburg to Ottawa (Illinois) | 1,800.17 mi (2,897.09 km) |
| Healdsburg to Ottawa (Kansas) | 1,484.51 mi (2,389.09 km) |
| Healdsburg to Ottumwa (Iowa) | 1,615.94 mi (2,600.60 km) |
| Healdsburg to Overland (Missouri) | 1,743.94 mi (2,806.60 km) |
| Healdsburg to Overland Park (Kansas) | 1,512.30 mi (2,433.81 km) |
| Healdsburg to Overlea (Maryland) | 2,461.51 mi (3,961.42 km) |
| Healdsburg to Oviedo (Florida) | 2,471.30 mi (3,977.18 km) |
| Healdsburg to Owasso (Oklahoma) | 1,486.11 mi (2,391.67 km) |
| Healdsburg to Owatonna (Minnesota) | 1,573.39 mi (2,532.13 km) |
| Healdsburg to Owensboro (Kentucky) | 1,929.85 mi (3,105.80 km) |
| Healdsburg to Owings Mills (Maryland) | 2,446.53 mi (3,937.32 km) |
| Healdsburg to Owosso (Michigan) | 2,027.52 mi (3,262.98 km) |
