| Healdsburg to Oerlinghausen | 5,532.15 mi (8,903.13 km) |
| Healdsburg to Oestrich-Winkel | 5,624.03 mi (9,051.00 km) |
| Healdsburg to Offenburg | 5,707.22 mi (9,184.89 km) |
| Healdsburg to Oftersheim | 5,674.53 mi (9,132.28 km) |
| Healdsburg to Ohrdruf | 5,647.98 mi (9,089.54 km) |
| Healdsburg to Ohringen | 5,708.28 mi (9,186.59 km) |
| Healdsburg to Olbernhau | 5,720.72 mi (9,206.60 km) |
| Healdsburg to Olching | 5,812.36 mi (9,354.09 km) |
| Healdsburg to Oldenburg | 5,455.54 mi (8,779.84 km) |
| Healdsburg to Oldenburg in Holstein | 5,455.04 mi (8,779.04 km) |
| Healdsburg to Olfen | 5,513.11 mi (8,872.49 km) |
| Healdsburg to Olpe | 5,563.39 mi (8,953.41 km) |
| Healdsburg to Olsberg | 5,561.75 mi (8,950.77 km) |
| Healdsburg to Oranienburg | 5,597.68 mi (9,008.59 km) |
| Healdsburg to Ortenberg | 5,631.90 mi (9,063.67 km) |
