| Indiana to Oerlinghausen | 4,004.29 mi (6,444.29 km) |
| Indiana to Oestrich-Winkel | 4,039.82 mi (6,501.46 km) |
| Indiana to Offenburg | 4,086.23 mi (6,576.15 km) |
| Indiana to Oftersheim | 4,083.10 mi (6,571.12 km) |
| Indiana to Ohrdruf | 4,119.59 mi (6,629.84 km) |
| Indiana to Ohringen | 4,125.03 mi (6,638.59 km) |
| Indiana to Olbernhau | 4,224.27 mi (6,798.30 km) |
| Indiana to Olching | 4,231.07 mi (6,809.25 km) |
| Indiana to Oldenburg | 3,951.50 mi (6,359.32 km) |
| Indiana to Oldenburg in Holstein | 4,014.40 mi (6,460.55 km) |
| Indiana to Olfen | 3,962.76 mi (6,377.44 km) |
| Indiana to Olpe | 4,001.53 mi (6,439.84 km) |
| Indiana to Olsberg | 4,016.37 mi (6,463.72 km) |
| Indiana to Oranienburg | 4,149.68 mi (6,678.27 km) |
| Indiana to Ortenberg | 4,069.95 mi (6,549.95 km) |
