Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Saint Josephs College | School | 130 | Frederick | 39 41 39 N | 077 19 33 W |
| Saint Luke Cemetery | Cemetery | 114 | Frederick | 39 23 06 N | 077 28 31 W |
| Saint Luke Lutheran Church | Church | 113 | Frederick | 39 23 07 N | 077 28 32 W |
| Saint Lukes Protestant Episcopal Church (historical) | Church | 93 | Frederick | 39 18 38 N | 077 28 31 W |
| Saint Mark Lutheran Church | Church | 335 | Frederick | 39 42 06 N | 077 27 29 W |
| Saint Marks Cemetery | Cemetery | 338 | Frederick | 39 34 57 N | 077 33 27 W |
| Saint Marks Cemetery | Cemetery | 153 | Frederick | 39 21 08 N | 077 36 00 W |
| Saint Marks Church | Church | 152 | Frederick | 39 21 06 N | 077 35 58 W |
| Saint Marks Church | Church | 343 | Frederick | 39 34 56 N | 077 33 23 W |
| Saint Mary Run | Stream | | Frederick | 39 41 30 N | 077 19 25 W |
| Saint Marys Cemetery | Cemetery | 160 | Frederick | 39 20 54 N | 077 36 57 W |
| Saint Marys Church | Church | 159 | Frederick | 39 20 53 N | 077 36 59 W |
| Saint Matthews Cemetery | Cemetery | 117 | Frederick | 39 20 38 N | 077 28 31 W |
| Saint Matthews Church | Church | 117 | Frederick | 39 20 38 N | 077 28 30 W |
| Saint Paul Church | Church | 71 | Frederick | 39 15 43 N | 077 25 53 W |
| Saint Paul Lutheran Church | Church | 203 | Frederick | 39 30 27 N | 077 34 02 W |
| Saint Paul Lutheran Church | Church | 122 | Frederick | 39 32 13 N | 077 24 57 W |
| Saint Paul Lutheran Church | Church | 177 | Frederick | 39 23 36 N | 077 37 44 W |
| Saint Paul Lutheran Church | Church | 93 | Frederick | 39 29 09 N | 077 21 10 W |
| Saint Paul Lutheran Church | Church | 179 | Frederick | 39 21 43 N | 077 32 04 W |
| Saint Pauls Cemetery | Cemetery | 110 | Frederick | 39 31 30 N | 077 23 37 W |
| Saint Pauls Cemetery | Cemetery | 117 | Frederick | 39 17 14 N | 077 31 44 W |
| Saint Pauls Church | Church | 115 | Frederick | 39 17 13 N | 077 31 43 W |
| Saint Pauls Evangelical Lutheran Church | Church | 110 | Frederick | 39 31 31 N | 077 23 39 W |
| Saint Pauls Reformed Church (historical) | Church | 110 | Frederick | 39 31 31 N | 077 23 39 W |
| Saint Peters Cemetery | Cemetery | 164 | Frederick | 39 29 13 N | 077 14 24 W |
| Saint Peters Rocky Hill Cemetery | Cemetery | 166 | Frederick | 39 31 50 N | 077 17 16 W |
| Saint Peters Roman Catholic Church | Church | 161 | Frederick | 39 29 12 N | 077 14 25 W |
| Saint Timothy Catholic Church | Church | 96 | Frederick | 39 29 05 N | 077 20 59 W |
| Saint Timothys Sunday School | School | 87 | Frederick | 39 24 31 N | 077 23 44 W |
| Salamander Rock | Summit | 562 | Frederick | 39 34 32 N | 077 29 17 W |
| Salem United Methodist Church | Church | 316 | Frederick | 39 34 26 N | 077 33 04 W |
| Samhill Estates | Populated Place | 223 | Frederick | 39 20 59 N | 077 11 27 W |
| Sams Creek | Populated Place | 169 | Frederick | 39 29 57 N | 077 06 57 W |
| Sams Creek Cemetery | Cemetery | 154 | Frederick | 39 31 31 N | 077 09 50 W |
| Sams Creek Church | Church | 163 | Frederick | 39 31 29 N | 077 10 37 W |
| Sams Creek Methodist Protestant Church (historical) | Church | 156 | Frederick | 39 31 32 N | 077 09 48 W |
| Samuels Run | Stream | | Frederick | 39 23 22 N | 077 36 51 W |
| San-Di-Gan | Populated Place | 191 | Frederick | 39 26 32 N | 077 28 24 W |
| Sanandrews | Populated Place | 138 | Frederick | 39 25 30 N | 077 16 49 W |
| Sand Flat | Flat | 526 | Frederick | 39 33 34 N | 077 29 41 W |
| Sandy Run | Stream | | Frederick | 39 33 16 N | 077 23 08 W |
| Sandy Run Estates | Populated Place | 109 | Frederick | 39 33 24 N | 077 23 37 W |
| School Run | Stream | | Frederick | 39 22 12 N | 077 17 25 W |
| Scouts Knoll | Populated Place | 147 | Frederick | 39 28 13 N | 077 18 49 W |
| Sensenbaugh School (historical) | School | 418 | Frederick | 39 36 56 N | 077 33 03 W |
| Sevenfoot Rock | Cliff | 362 | Frederick | 39 26 52 N | 077 29 03 W |
| Seymour B Cooper Memorial Wildlife Sanctuary | Park | 367 | Frederick | 39 40 15 N | 077 25 10 W |
| Shadows of the Old South | Locale | 176 | Frederick | 39 25 34 N | 077 36 14 W |
| Shady Grove | Populated Place | 190 | Frederick | 39 31 21 N | 077 32 47 W |
| Shamrock Acres | Populated Place | 292 | Frederick | 39 40 52 N | 077 24 22 W |
| Sharrer Heights | Populated Place | 137 | Frederick | 39 34 27 N | 077 17 55 W |
| Shel-Mar Heights | Populated Place | 148 | Frederick | 39 17 13 N | 077 19 17 W |
| Sheridan Hall | Building | 172 | Frederick | 39 41 00 N | 077 21 04 W |
| Sherwood Forest | Populated Place | 185 | Frederick | 39 23 15 N | 077 14 09 W |
| Shookstown | Populated Place | 141 | Frederick | 39 26 08 N | 077 28 02 W |
| Shookstown Heights | Populated Place | 139 | Frederick | 39 26 05 N | 077 27 52 W |
| Shookstown Park | Park | 173 | Frederick | 39 26 27 N | 077 27 59 W |
| Shrawn Cottage | Building | | Frederick | 39 42 11 N | 077 42 19 W |
| Shriner Hall | Building | | Frederick | 39 42 26 N | 077 42 35 W |
| Sidmar | Populated Place | 158 | Frederick | 39 33 12 N | 077 15 47 W |
| Silo Hill (subdivision) | Populated Place | 128 | Frederick | 39 42 15 N | 077 19 03 W |
| Silver Fern Estates | Populated Place | 207 | Frederick | 39 23 58 N | 077 10 33 W |
| Silver Hill | Populated Place | 146 | Frederick | 39 27 22 N | 077 18 52 W |
| Silver Hill Church | Church | 159 | Frederick | 39 27 21 N | 077 18 49 W |
| Silver Maple Estates | Populated Place | 189 | Frederick | 39 19 53 N | 077 14 53 W |
| Simpson Methodist Episcopal Church | Church | 157 | Frederick | 39 22 58 N | 077 16 04 W |
| Skyline Estates | Populated Place | 247 | Frederick | 39 23 16 N | 077 30 41 W |
| Skyline Gardens | Populated Place | 262 | Frederick | 39 23 45 N | 077 30 32 W |
| Skyline Manor | Populated Place | 251 | Frederick | 39 20 33 N | 077 12 19 W |
| Skyline Woods | Populated Place | 239 | Frederick | 39 21 08 N | 077 12 09 W |
| Slabtown | Populated Place | 154 | Frederick | 39 21 04 N | 077 35 47 W |
| Sleepy Hollow Estates | Populated Place | 167 | Frederick | 39 22 25 N | 077 18 53 W |
| Smeltzer | Populated Place | 437 | Frederick | 39 36 54 N | 077 31 32 W |
| Smith | Populated Place | 184 | Frederick | 39 19 13 N | 077 16 20 W |
| Smith Hall | Building | | Frederick | 39 42 22 N | 077 42 22 W |
| Smith Village | Populated Place | 219 | Frederick | 39 20 08 N | 077 13 44 W |
| Smithbrook Acres | Populated Place | 164 | Frederick | 39 38 36 N | 077 24 37 W |
| Snowden | Populated Place | 116 | Frederick | 39 39 37 N | 077 16 31 W |
| Snowmill Farm | Locale | 199 | Frederick | 39 25 39 N | 077 08 32 W |
| Somerset | Populated Place | 266 | Frederick | 39 24 38 N | 077 30 27 W |
| South Covell | Populated Place | 140 | Frederick | 39 19 56 N | 077 23 32 W |
| South End Park | Park | 99 | Frederick | 39 24 33 N | 077 25 23 W |
| South Fork Bens Branch | Stream | | Frederick | 39 24 45 N | 077 13 54 W |
| South Fork Linganore Creek | Stream | | Frederick | 39 26 56 N | 077 13 17 W |
| South Frederick Elementary School | School | 98 | Frederick | 39 24 34 N | 077 24 60 W |
| South Frederick Primary School (historical) | School | 98 | Frederick | 39 24 34 N | 077 24 60 W |
| South Glen | Populated Place | 168 | Frederick | 39 22 48 N | 077 13 47 W |
| South Mountain Campground | Locale | 301 | Frederick | 39 31 50 N | 077 35 59 W |
| South Timber | Populated Place | 204 | Frederick | 39 26 08 N | 077 10 15 W |
| Spiderbush Nature Trail | Trail | 519 | Frederick | 39 38 55 N | 077 28 36 W |
| Sponsellers (subdivision) | Populated Place | 165 | Frederick | 39 23 04 N | 077 16 54 W |
| Spoolsville | Populated Place | 134 | Frederick | 39 27 00 N | 077 33 41 W |
| Spout Spring | Spring | 231 | Frederick | 39 29 30 N | 077 28 26 W |
| Spring Garden Estates | Populated Place | 97 | Frederick | 39 28 22 N | 077 21 29 W |
| Spring Ridge | Populated Place | 112 | Frederick | 39 24 05 N | 077 21 09 W |
| Spring Ridge Elementary School | School | 119 | Frederick | 39 23 52 N | 077 20 41 W |
| Spring Valley (subdivision) | Populated Place | 104 | Frederick | 39 25 56 N | 077 24 43 W |
| Springdale | Populated Place | 212 | Frederick | 39 25 03 N | 077 30 35 W |
| Springview | Populated Place | 149 | Frederick | 39 20 55 N | 077 33 04 W |
| Spruce Run | Stream | | Frederick | 39 34 14 N | 077 31 54 W |
| Standford Industrial Park | Locale | 124 | Frederick | 39 20 49 N | 077 30 02 W |
| Station Roads | Populated Place | 175 | Frederick | 39 28 45 N | 077 35 06 W |
| Staubs Thurmont Acres | Populated Place | 162 | Frederick | 39 38 17 N | 077 24 13 W |
| Stauffer | Populated Place | 109 | Frederick | 39 28 10 N | 077 20 04 W |
| Steep Creek | Stream | | Frederick | 39 32 10 N | 077 28 29 W |
| Stevens Airport (historical) | Airport | 136 | Frederick | 39 30 46 N | 077 24 39 W |
| Stockman | Populated Place | 181 | Frederick | 39 24 07 N | 077 29 34 W |
| Stockman Estates | Populated Place | 159 | Frederick | 39 22 00 N | 077 33 01 W |
| Stolcrest Stolport | Airport | 161 | Frederick | 39 20 30 N | 077 18 13 W |