| Healdsburg to Orangevale (California) | 88.83 mi (142.96 km) |
| Healdsburg to Orchards (Washington) | 488.55 mi (786.25 km) |
| Healdsburg to Orcutt (California) | 292.45 mi (470.65 km) |
| Healdsburg to Oregon (Ohio) | 2,075.22 mi (3,339.75 km) |
| Healdsburg to Oregon (Wisconsin) | 1,764.66 mi (2,839.94 km) |
| Healdsburg to Oregon City (Oregon) | 464.48 mi (747.50 km) |
| Healdsburg to Orem (Utah) | 606.34 mi (975.81 km) |
| Healdsburg to Orinda (California) | 63.33 mi (101.93 km) |
| Healdsburg to Orland Park (Illinois) | 1,848.25 mi (2,974.47 km) |
| Healdsburg to Orlando (Florida) | 2,468.98 mi (3,973.43 km) |
| Healdsburg to Ormond Beach (Florida) | 2,455.92 mi (3,952.42 km) |
| Healdsburg to Oro Valley (Arizona) | 793.03 mi (1,276.27 km) |
| Healdsburg to Oroville (California) | 92.48 mi (148.83 km) |
| Healdsburg to Oshkosh (Wisconsin) | 1,804.95 mi (2,904.79 km) |
| Healdsburg to Oskaloosa (Iowa) | 1,603.17 mi (2,580.06 km) |
