| Ostrow Mazowiecka to Siran | 1,190.02 mi (1,915.16 km) |
| Ostrow Mazowiecka to Sirnak | 1,445.11 mi (2,325.69 km) |
| Ostrow Mazowiecka to Sirvan | 1,400.94 mi (2,254.59 km) |
| Ostrow Mazowiecka to Sivas | 1,150.19 mi (1,851.05 km) |
| Ostrow Mazowiecka to Sivasli | 1,056.73 mi (1,700.65 km) |
| Ostrow Mazowiecka to Siverek | 1,333.72 mi (2,146.42 km) |
| Ostrow Mazowiecka to Sivrice | 1,293.54 mi (2,081.76 km) |
| Ostrow Mazowiecka to Sivrihisar | 1,029.30 mi (1,656.50 km) |
| Ostrow Mazowiecka to Sogut | 965.71 mi (1,554.16 km) |
| Ostrow Mazowiecka to Sogutlu | 915.29 mi (1,473.02 km) |
| Ostrow Mazowiecka to Soke | 1,072.96 mi (1,726.77 km) |
| Ostrow Mazowiecka to Solhan | 1,319.32 mi (2,123.23 km) |
| Ostrow Mazowiecka to Soma | 978.81 mi (1,575.24 km) |
| Ostrow Mazowiecka to Sorgun | 1,095.00 mi (1,762.24 km) |
| Ostrow Mazowiecka to Suhut | 1,068.80 mi (1,720.07 km) |
