|Coaching career (HC unless noted)|
|Head coaching record|
McKinley graduated from Armstrong High School—now known as Friendship Armstrong Academy—in Washington, D.C.. He then attended Virginia Union University for a year before transferring to New York University (NYU), from which he graduated in 1931 with a Bachelor of Science in physical education. He was the first African-American to receive a B.S. degree from the Department of Physical Education at NYU.
Head coaching record
|Delaware State Hornets (Independent) (1931)|
- "Dover State Upsets Bordentown, 14-13". The New York Age. New York, New York. October 24, 1931. p. 6. Retrieved July 29, 2021 – via Newspapers.com .
- "Jno.[sic] L. McKinley Receives Degree In Physical Education". The New York Age. New York, New York. August 1, 1931. p. 6. Retrieved July 29, 2021 – via Newspapers.com .