Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Sherwood Elementary School | School | 110 | Snohomish | 47 47 24 N | 122 22 26 W |
| Sherwood Forest Elementary | School | 125 | King | 47 16 43 N | 122 21 11 W |
| Sherwood Forest Elementary School | School | 122 | King | 47 37 50 N | 122 07 13 W |
| Shiloh Hills Elementary School | School | 623 | Spokane | 47 44 04 N | 117 24 04 W |
| Shining Mountain Elementary School | School | 135 | Pierce | 47 03 50 N | 122 22 42 W |
| Shoe House School | School | 617 | Spokane | 47 41 44 N | 117 26 06 W |
| Shorecrest High School | School | 110 | King | 47 44 26 N | 122 18 11 W |
| Shoreline Alternative School | School | 122 | King | 47 45 37 N | 122 19 58 W |
| Shoreline Community College | School | 141 | King | 47 44 55 N | 122 21 33 W |
| Shorewood Elementary School | School | 82 | King | 47 29 54 N | 122 22 04 W |
| Shorewood High School | School | 141 | King | 47 45 19 N | 122 20 56 W |
| Shoultes Elementary School | School | 29 | Snohomish | 48 07 07 N | 122 09 44 W |
| Showalter Middle School | School | 83 | King | 47 28 29 N | 122 16 30 W |
| Shuksan Middle School | School | 32 | Whatcom | 48 46 46 N | 122 30 04 W |
| Shumway Middle School | School | 61 | Clark | 45 38 37 N | 122 40 05 W |
| Sierra Heights Elementary School | School | 132 | King | 47 30 52 N | 122 09 56 W |
| Sifton Elementary School | School | 73 | Clark | 45 40 32 N | 122 31 49 W |
| Silver Beach Elementary School | School | 118 | Whatcom | 48 46 06 N | 122 24 58 W |
| Silver Lake Christian School | School | 142 | Snohomish | 47 52 52 N | 122 12 23 W |
| Silver Lake Elementary | School | 91 | King | 47 18 33 N | 122 22 00 W |
| Silver Star Elementary School | School | 71 | Clark | 45 41 05 N | 122 33 54 W |
| Silverdale Elementary School | School | 110 | Kitsap | 47 38 36 N | 122 43 08 W |
| Silverdale Grade School | School | 5 | Kitsap | 47 38 47 N | 122 41 51 W |
| Simpson Avenue Elementary School | School | 20 | Grays Harbor | 46 58 59 N | 123 36 22 W |
| Skagit Valley Junior College | School | 56 | Skagit | 48 25 27 N | 122 19 42 W |
| Skamania Elementary School | School | 50 | Skamania | 45 37 01 N | 122 02 56 W |
| Skokomish Valley School | School | 12 | Mason | 47 19 00 N | 123 12 32 W |
| Sky Valley Seventh Day Adventist School | School | 16 | Snohomish | 47 50 56 N | 121 59 13 W |
| Skykomish Elementary School | School | 283 | King | 47 42 34 N | 121 21 44 W |
| Skykomish High School | School | 283 | King | 47 42 34 N | 121 21 44 W |