| Union Sd 5, OR (District) |
| Union SD 81, IL (District) |
| Union Springs Central School District, NY (District) |
| Union Star R-Ii, MO (District) |
| Union Township School, NJ (District) |
| Union Township School Corp, IN (District) |
| Union-endicott Central School District, NY (District) |
| Union-North United School Corp, IN (District) |
| Union-Scioto Local School District, OH (District) |
| Uniondale Union Free School District, NY (District) |
| Uniontown, KS (District) |
| Uniontown Area SD, PA (District) |
| Unionville-Chadds Ford SD, PA (District) |
| Unionville-Sebewaing Area S.D., MI (District) |
| United 7, ND (District) |
