| Islesboro School Department, ME (District) |
| Islip Union Free School District, NY (District) |
| Issaquah School District, WA (District) |
| Issaquena County, MS (ISD) |
| iSTEM Geauga Early College High School, OH (District) |
| Isthmus Montessori Academy Inc, WI (PSA) |
| Isthmus Montessori Academy Public, WI (PSA) |
| ISU Laboratory Schools, IL (District) |
| Isucceed Virtual High School, ID (PSA) |
| Italy ISD, TX (District) |
| Itasca Area Schools Collaborative, MN (District) |
| Itasca County, MN (ISD) |
| Itasca ISD, TX (District) |
| Itasca SD 10, IL (District) |
| Itawamba Co School Dist, MS (District) |
