| ARGYLE SOUTH EL | 783 | regular | other |
| ARGYLE WEST | 643 | regular | other |
| Arickaree Elementary School | 48 | regular | other |
| Arickaree Undivided High School | 34 | regular | other |
| Ariel Elem Community Academy | 364 | regular | other |
| Aris Woodwinds | 22 | alternative | other |
| ARISE High | 396 | regular | high |
| ARISE Shelter Care - 71 | 4 | alternative | other |
| ARISE Virtual Academy | 119 | regular | other |
| ARISTOI CLASSICAL ACADEMY | 431 | regular | elementary |
| ARISTOI CLASSICAL ACADEMY | 511 | regular | elementary |
| ARISTOI CLASSICAL UPPER SCHOOL | 664 | regular | other |
| Aristotle Preparatory Academy | 277 | regular | elementary |
| Ariton School | 887 | regular | other |
| Arizona Agribusiness & Equine Center - Estrella | 335 | regular | high |
| Arizona Agribusiness & Equine Center Inc. - Mesa | 97 | regular | high |
| Arizona Agribusiness & Equine Center Inc. - Prescott Valley | 327 | regular | high |
| Arizona Autism Charter - Online High School | 92 | special-ed | high |
| Arizona Autism Charter School | 201 | regular | elementary |
| Arizona Autism Charter School Upper School Campus | 307 | special-ed | other |
| Arizona Autism Charter School West Valley Campus | 199 | regular | elementary |
| Arizona Autism Charter School-Online K-8 | 106 | regular | elementary |
| Arizona Charter Academy | 1,049 | regular | elementary |
| Arizona City Elementary School | 790 | regular | other |
| Arizona College Prep High School | 2,271 | regular | other |
| Arizona College Prep Middle School | 907 | regular | middle |
| Arizona Collegiate High School | 139 | alternative | high |
| Arizona Connections Academy | 1,891 | regular | other |
| Arizona Conservatory for Arts and Academics | 173 | regular | high |
| Arizona Conservatory for Arts and Academics Elementary Schoo | 109 | regular | elementary |
| Arizona Conservatory for Arts and Academics Middle School | 235 | regular | middle |
| Arizona Desert Elementary School | 662 | regular | elementary |
| Arizona Desert Elementary School | 843 | regular | other |
| ARIZONA FLEMING EL | 462 | regular | other |
| Arizona Insight Academy | 955 | alternative | other |
| Arizona K-8 Online Academy | 112 | regular | elementary |
| Arizona Language Preparatory | 73 | regular | elementary |
| Arizona Middle | 804 | regular | middle |
| Arizona Online Charter School | 42 | regular | elementary |
| Arizona Preparatory Academy | 233 | alternative | high |
| Arizona School For The Arts | 679 | regular | other |
| Arizona Virtual Academy | 4,476 | regular | other |
| ARK CONSOLIDATED HIGH SCHOOL | 106 | regular | other |
| Ark Independent Studies | 56 | alternative | other |
| ARK. SCHOOL FOR THE BLIND ELEM | 30 | special-ed | other |
| ARK. SCHOOL FOR THE BLIND H.S. | 32 | special-ed | other |
| ARKADELPHIA HIGH SCHOOL | 534 | regular | high |
| ARKANSAS ARTS ACADEMY ELEMENTARY/MIDDLE SCHOOL | 523 | regular | elementary |
| ARKANSAS ARTS ACADEMY HIGH SCHOOL | 422 | regular | other |
| Arkansas City High | 885 | regular | high |
