Harding is non-selective and does not have entry tests or interviews, but in March 2012, application numbers required a lottery to be instituted for the available places.

[2] The school reflects the diversity of the Oklahoma City metropolitan area; in 2013 people of color constituted 58% of enrollment, 48% were economically disadvantaged, and two thirds of its graduates were first-generation college students.

[3] Harding has a rigorous academic curriculum based on a 4x4 (four years of math, science, English, and social studies) plan featuring required Advanced Placement courses, two years of foreign language, and fine arts.

[7] In 2016 the school received an A+ grade from the state Department of Education for the fourth consecutive year.

[8] Beginning in the 2019–2020 school year, Harding Charter Preparatory High School was relocated to the former Oklahoma Centennial High School building, located at 1301 NE 101st St., due to the closure and sale of the historic building at 3333 N Shartel to Harding Fine Arts Academy by the OKCPS "Pathway to Greatness" project.