Each year, the lower grade was dropped and a higher grade was added, until 1997 when the school became a 9–12 high school, Eastside High.

This number decreased slightly with the opening of Newton County's third high school, Alcovy High School, in the fall of 2006.

It was announced in March 2019 that Eastside would move to a new location that would open at the beginning of the 2021-2022 school year.

Due to construction delays, Eastside instead moved into its new location at the beginning of the 2022-2023 school year, and the Newton County Theme School, renamed the Newton County STEAM Academy, moved into the former Eastside building at the beginning of the 2023-2024 school year.

Eastside High School is accredited by the Southern Association of Colleges and Schools to award College Preparatory and Technology Preparatory diplomas to graduates.