Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Saint Stanislaus Tri-Parish School | School | 257 | Nez Perce | 46 24 59 N | 117 01 23 W |
| Saints Peter and Paul School | School | 1056 | Idaho | 45 55 18 N | 116 07 39 W |
| Saling School | School | 785 | Washington | 44 21 14 N | 116 52 22 W |
| Salmon Elementary-Junior High School | School | 1205 | Lemhi | 45 10 19 N | 113 53 30 W |
| Salmon Pioneer Primary School | School | 1205 | Lemhi | 45 10 20 N | 113 53 28 W |
| Salmon River Junior - Senior High School | School | 570 | Idaho | 45 25 08 N | 116 19 11 W |
| Salmon Senior High School | School | 1207 | Lemhi | 45 10 14 N | 113 53 12 W |
| Salmon Seventh-Day Adventist School | School | 1236 | Lemhi | 45 11 05 N | 113 54 18 W |
| Sandcreek Middle School | School | 1438 | Bonneville | 43 28 23 N | 111 58 30 W |
| Sandpoint High School | School | 639 | Bonner | 48 16 13 N | 116 34 09 W |
| Sandpoint Junior Academy | School | 637 | Bonner | 48 16 22 N | 116 34 46 W |
| Sandpoint Middle School | School | 639 | Bonner | 48 16 10 N | 116 34 09 W |
| Sandy Creek School (historical) | School | 1404 | Lemhi | 45 02 54 N | 113 40 14 W |
| Satellite Center Preschool | School | 1510 | Fremont | 43 58 02 N | 111 41 40 W |
| Sawtooth Elementary School | School | 1128 | Twin Falls | 42 34 31 N | 114 27 07 W |
| Sawtooth School | School | 1128 | Twin Falls | 42 34 30 N | 114 27 06 W |
| Scism School | School | 781 | Canyon | 43 29 43 N | 116 36 42 W |
| Second Chance Project Alternative High School | School | 1370 | Bingham | 43 10 54 N | 112 21 22 W |
| Selkirk School | School | 682 | Bonner | 48 16 22 N | 116 35 54 W |
| Seltice Elementary School | School | 664 | Kootenai | 47 43 06 N | 116 57 27 W |
| Seventh-Day Adventist Elementary School | School | 732 | Canyon | 43 38 55 N | 116 40 32 W |
| Shelley Junior High School | School | 1412 | Bingham | 43 22 27 N | 112 07 20 W |
| Shelley Senior High School | School | 1410 | Bingham | 43 22 27 N | 112 07 58 W |
| Shilling Elementary School | School | 1372 | Bingham | 43 11 12 N | 112 20 33 W |
| Shiloh Schools | School | 278 | Nez Perce | 46 23 08 N | 117 02 21 W |
| Shoestring School | School | 1037 | Gooding | 42 51 55 N | 114 47 12 W |
| Shoshone High School | School | 1210 | Lincoln | 42 55 58 N | 114 24 32 W |
| Shoshone Junior-Senior High School | School | 1210 | Lincoln | 42 55 58 N | 114 24 34 W |
| Shoshone Opportunity School | School | 971 | Shoshone | 47 30 21 N | 115 54 21 W |
| Silver Hills Junior High School | School | 779 | Shoshone | 47 29 57 N | 115 59 01 W |