| Merrillville to Opole | 4,643.98 mi (7,473.76 km) |
| Merrillville to Orzesze | 4,694.37 mi (7,554.85 km) |
| Merrillville to Osowa | 4,502.23 mi (7,245.64 km) |
| Merrillville to Ostroda | 4,580.96 mi (7,372.35 km) |
| Merrillville to Ostroleka | 4,659.71 mi (7,499.08 km) |
| Merrillville to Ostrow Mazowiecka | 4,682.19 mi (7,535.25 km) |
| Merrillville to Ostrow Wielkopolski | 4,598.04 mi (7,399.83 km) |
| Merrillville to Ostrowiec Swietokrzyski | 4,749.30 mi (7,643.26 km) |
| Merrillville to Ostrzeszow | 4,611.91 mi (7,422.15 km) |
| Merrillville to Oswiecim | 4,715.45 mi (7,588.78 km) |
| Merrillville to Otwock | 4,692.16 mi (7,551.31 km) |
| Merrillville to Ozarow Mazowiecki | 4,672.54 mi (7,519.73 km) |
| Merrillville to Ozimek | 4,653.30 mi (7,488.76 km) |
| Merrillville to Ozorkow | 4,633.57 mi (7,457.01 km) |
| Merrillville to Pabianice | 4,650.62 mi (7,484.45 km) |
