| Union County TEAMS Charter School, NJ (District) |
| Union County Vocational-Technical School District, NJ (District) |
| Union Elementary, CA (District) |
| Union Elementary District, AZ (District) |
| Union Free School District Of The Tarrytowns, NY (District) |
| Union Gap School District, WA (District) |
| Union Grove ISD, TX (District) |
| Union Grove J1 School District, WI (District) |
| Union Grove UHS School District, WI (District) |
| Union Hill Elementary, CA (District) |
| Union Hill ISD, TX (District) |
| Union Local School District, OH (District) |
| Union Parish, LA (ISD) |
| Union Parish, LA (District) |
| Union Public School Dist, MS (District) |
