| Jackson-Milton High School | North Jackson | Public school | 9–12 | 0 |
| Jackson-Milton Middle School | North Jackson | Public school | 6–8 | 0 |
| Jackson Northview Elementary School | Jackson | Public school | PK–5 | 0 |
| Jackson Southview Elementary School | Jackson | Public school | PK–5 | 0 |
| Jackson Westview Elementary School | Jackson | Public school | PK–5 | 0 |
| Jacob Coy Middle School | Xenia | Public school | 6–8 | 0 |
| James A Garfield Elementary School | Garrettsville | Public school | PK–6 | 0 |
| James A. Garfield Elementary School | Marion | Public school | PK–5 | 0 |
| James A Garfield High School | Garrettsville | Public school | 9–12 | 0 |
| James A Garfield Middle School | Garrettsville | Public school | 7–8 | 0 |
| James A Harmon Elementary School | Grove City | Public school | PK–4 | 0 |
| James Conger Elementary School | Delaware | Public school | K–5 | 0 |
| James J Hilfiker Elementary School | Gibsonburg | Public school | PK–5 | 0 |
| James N. Gamble Montessori Elementary School | Cincinnati | Public school | PK–6 | 0 |
| James N. Gamble Montessori High School | Cincinnati | Public school | 7–12 | 0 |
| Jane Chance Intermediate School | Miamisburg | Public school | 3–5 | 0 |
| Jasper Elementary School | Piketon | Public school | PK–4 | 0 |
| JC Sommer Elementary School | Grove City | Public school | K–4 | 0 |
| Jefferson Area Junior High School | Jefferson | Public school | 7–8 | 0 |
| Jefferson Area Local Schools Online | Jefferson | Public school | 5–11 | 0 |
| Jefferson Area Sr High School | Jefferson | Public school | 9–12 | 0 |
| Jefferson Ave Elementary School | Shadyside | Public school | PK–2 | 0 |
| Jefferson Classical Academy of Ohio | Columbus | Public school | K–8 | 0 |
| Jefferson County | Bloomingdale | Public school | 11–12 | 0 |
| Jefferson County Christian School | Wintersville | Private school | PK–12 | 0 |
| Jefferson Elementary | Jefferson | Public school | K–6 | 0 |
| Jefferson Elementary School | Gahanna | Public school | K–5 | 0 |
| Jefferson Elementary School | Eastlake | Public school | K–5 | 0 |
| Jefferson High School | Delphos | Public school | 6–12 | 0 |
| Jefferson Jr./Sr. High School | Dayton | Public school | 7–12 | 0 |
| Jefferson Junior High School | Toledo | Public school | 8 | 0 |
| Jefferson Middle School | Delphos | Public school | 5–8 | 0 |
| Jefferson PK-8 School | Warren | Public school | PK–8 | 0 |
| Jefferson Primary School | Findlay | Public school | K–2 | 0 |
| Jennings Community Learning Center | Akron | Public school | 6–8 | 0 |
| Jerusalem Elementary School | Curtice | Public school | K–4 | 0 |
| Jesup W. Scott High School | Toledo | Public school | 9–12 | 0 |
| John Adams College & Career Academy | Cleveland | Public school | 9–12 | 0 |
| John C Dempsey Middle School | Delaware | Public school | 6–8 | 0 |
| John Clem Elementary School | Newark | Public school | K–5 | 0 |
| John E Gregg Elementary School | Bergholz | Public school | PK–6 | 0 |
| John F Keenedy Catholic School | Warren | Private school | K–5 | 0 |
| John F Kennedy Catholic School Upper Campus | Warren | Private school | 6–12 | 0 |
| John F. Kennedy Elementary School | Maple Heights | Public school | 1–4 | 0 |
| John F Kennedy High School | Cleveland | Public school | 8–12 | 0 |
| John Foster Dulles Elementary School | Cincinnati | Public school | PK–5 | 0 |
| John Glenn High School | New Concord | Public school | 8–12 | 0 |
| John J. Gilligan Digital Academy | Cincinnati | Public school | K–12 | 0 |
| John Marshall School of Business and Civic Leadership | Cleveland | Public school | 9–12 | 0 |
| John Marshall School of Engineering | Cleveland | Public school | 9–12 | 0 |