| Sachin |
| Sailly-Labourse |
| Sailly-au-Bois |
| Sailly-en-Ostrevent |
| Sailly-sur-la-Lys |
| Sains-en-Gohelle |
| Sains-lès-Fressin |
| Sains-lès-Marquion |
| Sains-lès-Pernes |
| Saint-Amand |
| Saint-Aubin |
| Saint-Augustin |
| Saint-Denoeux |
| Saint-Etienne-au-Mont |
| Saint-Floris |
| Saint-Folquin |
| Saint-Georges |
| Saint-Hilaire-Cottes |
| Saint-Inglevert |
| Saint-Josse |
| Saint-Laurent-Blangy |
| Saint-Léger |
| Saint-Léonard |
| Saint-Martin-Boulogne |
| Saint-Martin-Choquel |
| Saint-Martin-Lez-Tatinghem |
| Saint-Martin-d'Hardinghem |
| Saint-Martin-sur-Cojeul |
| Saint-Michel-sous-Bois |
| Saint-Michel-sur-Ternoise |
| Saint-Nicolas |
| Saint-Omer |
| Saint-Omer-Capelle |
| Saint-Pol-sur-Ternoise |
| Saint-Rémy-au-Bois |
| Saint-Tricat |
| Saint-Venant |
| Sainte-Austreberthe |
| Sainte-Catherine |
| Sainte-Marie-Kerque |
| Sallaumines |
| Salperwick |
| Samer |
| Sangatte |
| Sanghen |
| Sapignies |
| Sars-le-Bois |
| Sarton |
| Sauchy-Cauchy |
| Sauchy-Lestrée |
| Saudemont |
| Saulchoy |
| Saulty |
| Savy-Berlette |
| Selles |
| Sempy |
| Seninghem |
| Senlecques |
| Senlis |
| Serques |
| Servins |
| Setques |
| Sibiville |
| Simencourt |
| Siracourt |
| Sombrin |
| Sorrus |
| Souastre |
| Souchez |
| Surques |
| Sus-Saint-Léger |
| Séricourt |
