| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Sibret | city | Wallonie | Belgium | 49.97 | 5.63 | 1683 | 3709 |
| Signeulx | city | Wallonie | Belgium | 49.55 | 5.64 | 830 | 6009 |
| Silenrieux | city | Wallonie | Belgium | 50.22 | 4.42 | 830 | 16914 |
| Silly | city | Wallonie | Belgium | 50.65 | 3.92 | 269 | 7204 |
| Sin | city | Wallonie | Belgium | 50.52 | 3.44 | 49 | 15550 |
| Since Jean Gerot | city | Wallonie | Belgium | 49.97 | 5.13 | 1246 | 2506 |
| Sinsin | city | Wallonie | Belgium | 50.28 | 5.26 | 918 | 2471 |
| Sinsin la Grande | city | Wallonie | Belgium | 50.27 | 5.25 | 935 | 1913 |
| Sinsin la Petite | city | Wallonie | Belgium | 50.28 | 5.27 | 875 | 2471 |
| Sint-Djermwin | city | Wallonie | Belgium | 50.57 | 4.84 | 830 | 10485 |
| Sint-Djuråd | city | Wallonie | Belgium | 50.35 | 4.74 | 830 | 3300 |
| Sint-Djôr-so-Mouze | city | Wallonie | Belgium | 50.60 | 5.36 | 830 | 24954 |
| Sint-Dni-dlé-Bovesse | city | Wallonie | Belgium | 50.54 | 4.78 | 830 | 14067 |
| Sint-Houbert | city | Wallonie | Belgium | 50.03 | 5.37 | 1669 | 3881 |
| Sint-Jans-Geest | city | Wallonie | Belgium | 50.74 | 4.90 | 328 | 16040 |
| Sint-Ldjir | city | Wallonie | Belgium | 49.61 | 5.66 | 994 | 4090 |
| Sint-Må-dlé-Nameur | city | Wallonie | Belgium | 50.49 | 4.85 | 830 | 40957 |
| Sint-Nicolêye | city | Wallonie | Belgium | 50.63 | 5.53 | 830 | 159313 |
| Sint-Niklaas | city | Wallonie | Belgium | 50.63 | 5.53 | 830 | 159313 |
| Sint-Remigius-Geest | city | Wallonie | Belgium | 50.75 | 4.86 | 196 | 10493 |
| Sint-Renelde | city | Wallonie | Belgium | 50.70 | 4.16 | 229 | 35171 |
| Sint-Serwai | city | Wallonie | Belgium | 50.47 | 4.84 | 288 | 48855 |
| Sint-Vi | city | Wallonie | Belgium | 50.28 | 6.13 | 1669 | 6585 |
| Sint-Åbin | city | Wallonie | Belgium | 50.25 | 4.58 | 830 | 7607 |
| Sinzêye | city | Wallonie | Belgium | 50.18 | 4.46 | 862 | 3841 |
| Siom | city | Wallonie | Belgium | 50.02 | 5.48 | 1669 | 1897 |
| Sippenaachen | city | Wallonie | Belgium | 50.75 | 5.93 | 830 | 18009 |
| Sippenaeken | city | Wallonie | Belgium | 50.75 | 5.93 | 830 | 18009 |
| Sirault | city | Wallonie | Belgium | 50.51 | 3.79 | 246 | 19992 |
| Sirieux | city | Wallonie | Belgium | 50.53 | 4.06 | 357 | 23575 |
| Siroue | city | Wallonie | Belgium | 50.20 | 5.57 | 1220 | 4126 |
| Sivry | city | Wallonie | Belgium | 50.17 | 4.18 | 830 | 4176 |
| Sivry | city | Wallonie | Belgium | 49.67 | 5.62 | 1118 | 8769 |
| Sivry-Rance (Grandrieu) | city | Wallonie | Belgium | 50.20 | 4.17 | 830 | 6322 |
| Sivry-Rance (Rance) | city | Wallonie | Belgium | 50.14 | 4.28 | 830 | 5386 |
| Sivry-Rance (Sivry) | city | Wallonie | Belgium | 50.17 | 4.18 | 830 | 4176 |
| Six Maisons | city | Wallonie | Belgium | 50.70 | 4.40 | 390 | 63217 |
| Six Planes | city | Wallonie | Belgium | 49.88 | 4.97 | 1230 | 3347 |