| Healdsburg to Oakley (California) | 76.91 mi (123.77 km) |
| Healdsburg to Oakton (Virginia) | 2,428.78 mi (3,908.75 km) |
| Healdsburg to Oakville (Missouri) | 1,749.65 mi (2,815.79 km) |
| Healdsburg to Oatfield (Oregon) | 469.36 mi (755.36 km) |
| Healdsburg to Ocala (Florida) | 2,403.05 mi (3,867.34 km) |
| Healdsburg to Ocean Acres (New Jersey) | 2,570.69 mi (4,137.12 km) |
| Healdsburg to Ocean City (New Jersey) | 2,562.34 mi (4,123.69 km) |
| Healdsburg to Ocean Pines (Maryland) | 2,550.02 mi (4,103.86 km) |
| Healdsburg to Ocean Pointe (Hawaii) | 2,399.26 mi (3,861.24 km) |
| Healdsburg to Ocean Springs (Mississippi) | 2,008.55 mi (3,232.45 km) |
| Healdsburg to Oceanside (California) | 485.33 mi (781.06 km) |
| Healdsburg to Oceanside (New York) | 2,588.94 mi (4,166.50 km) |
| Healdsburg to Ocoee (Florida) | 2,455.15 mi (3,951.18 km) |
| Healdsburg to Oconomowoc (Wisconsin) | 1,809.43 mi (2,911.99 km) |
| Healdsburg to Odenton (Maryland) | 2,457.39 mi (3,954.78 km) |
