| City Name | County | Zip Code |
| Sabillasville | Frederick | 21780 |
| Saint Anthony | Frederick | 21727 |
| Saint Charles | Charles | ***** |
| Saint Inigoes | Saint Mary's | 20684 |
| Saint James | Washington | ***** |
| Saint Leonard | Calvert | 20685 |
| Saint Mary's City | Saint Mary's | 20686 |
| Saint Michaels | Talbot | ***** |
| Salisbury | Wicomico | ***** |
| Sandy Spring | Montgomery | 20860 |
| Sang Run | Garrett | 21541 |
| Sanmar | Washington | 21713 |
| Savage | Howard | 20763 |
| Scotland | Saint Mary's | 20687 |
| Seabrook | Prince George's | ***** |
| Seat Pleasant | Prince George's | 20743 |
| Secretary | Dorchester | 21664 |
| Selbysport | Garrett | 21531 |
| Severn | Anne Arundel | 21144 |
| Severna Park | Anne Arundel | 21146 |
| Shady Side | Anne Arundel | 20764 |
| Sharpsburg | Washington | 21782 |
| Sharptown | Wicomico | 21861 |
| Sherwood | Talbot | 21665 |
| Sherwood Forest | Anne Arundel | 21405 |
| Shoreham Beach | Anne Arundel | 21037 |
| Showell | Worcester | 21862 |
| Silver Run | Carroll | 21158 |
| Silver Spring | Montgomery | ***** |
| Simpsonville | Howard | 21150 |
| Smallwood | Carroll | 21157 |
| Smithsburg | Washington | 21783 |
| Snow Hill | Worcester | 21863 |
| Snydersburg | Carroll | 21074 |
| Solomons | Calvert | 20688 |
| Somerset | Montgomery | 20815 |
| Sparks | Baltimore | 21152 |
| Sparks Glencoe | Baltimore | 21152 |
| Spencerville | Montgomery | 20868 |
| Spoolsville | Frederick | 21769 |
| Spring Gap | Allegany | 21560 |
| Springdale | Prince George's | ***** |
| Stepney | Harford | 21001 |
| Stevenson | Baltimore | 21153 |
| Stevensville | Queen Anne's | 21666 |
| Still Pond | Kent | 21667 |
| Stockton | Worcester | 21864 |
| Street | Harford | 21154 |
| Sudlersville | Queen Anne's | 21668 |
| Suitland | Prince George's | ***** |
| Sunderland | Calvert | 20689 |
| Swanton | Garrett | 21561 |
| Sykesville | Carroll | 21784 |
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