| Slidell ISD, TX (District) |
| Slinger School District, WI (District) |
| Slippery Rock Area SD, PA (District) |
| Sloan-Hendrix School Dist., AR (District) |
| Slocum ISD, TX (District) |
| Slope County, ND (ISD) |
| Smackover School District, AR (District) |
| SMART Academy, OH (PSA) |
| Smee School District, SD (District) |
| Smethport Area SD, PA (District) |
| Smith Academy For Excellence, IN (District) |
| Smith Center, KS (District) |
| Smith Co School Dist, MS (District) |
| Smith County, MS (ISD) |
| Smith County, TN (District) |
