| Ostrow Mazowiecka to Sangeorz-Bai | 394.82 mi (635.41 km) |
| Ostrow Mazowiecka to Sannicolau Mare | 469.00 mi (754.78 km) |
| Ostrow Mazowiecka to Santana | 446.01 mi (717.78 km) |
| Ostrow Mazowiecka to Satu Mare | 348.90 mi (561.49 km) |
| Ostrow Mazowiecka to Scobinti | 435.47 mi (700.82 km) |
| Ostrow Mazowiecka to Scornicesti | 581.24 mi (935.41 km) |
| Ostrow Mazowiecka to Sebes | 478.50 mi (770.06 km) |
| Ostrow Mazowiecka to Seini | 354.37 mi (570.31 km) |
| Ostrow Mazowiecka to Sfantu-Gheorghe | 510.03 mi (820.82 km) |
| Ostrow Mazowiecka to Sibiu | 494.60 mi (795.99 km) |
| Ostrow Mazowiecka to Sighetu Marmatiei | 347.81 mi (559.75 km) |
| Ostrow Mazowiecka to Sighisoara | 472.88 mi (761.02 km) |
| Ostrow Mazowiecka to Simeria | 482.78 mi (776.95 km) |
| Ostrow Mazowiecka to Sinaia | 540.44 mi (869.76 km) |
| Ostrow Mazowiecka to Slatina | 589.09 mi (948.05 km) |
