As a junior in 2017–18, he averaged 21.9 points, 9.4 rebounds, 4.1 blocks, and 2.6 assists per game while shooting 67.0 percent from the field; he helped his team to a 20-win season, county and sectional titles, and the 4A regional final.

In AAU basketball, on the Spiece Indy Heat, he averaged 19.1 points, 7.1 rebounds, and 1.8 assists per game while shooting 59.1% from the field.

[3] On January 24, 2019, Jackson-Davis was announced as a McDonald's All-American to participate in the 2019 game,[4] where he finished with 7 points, 5 rebounds, and 1 block in 14 minutes.

[6] Sources: Jackson-Davis made his college debut for Indiana during the 2019–20 season with eight points and six rebounds in a 98–65 win over Western Illinois.

[7] Jackson-Davis was named Big Ten co-freshman of the week on November 18, after contributing 20 points, eight rebounds and three blocked shots against North Alabama.

[8] He was again named conference freshman of the week on December 2 after scoring 21 points and grabbing 11 rebounds in a victory over Louisiana Tech.

[25] His January averages of 23 points, over 14 rebounds and over three blocked shots, was one of only 3 (Shaquille O'Neal and Tim Duncan) such months in the last 25 years.

[28] In his senior season, Jackson-Davis averaged career bests in points (20.9), rebounds (10.8), assists (4.0), and blocked shots (2.9), helping to lead Indiana to a second-straight NCAA Tournament appearance.

Jackson-Davis was awarded the Karl Malone Award for the nation's top power forward, along with being named to the Oscar Robertson Trophy Late Season Watch List, the John R. Wooden Men's National Ballot, and the Naismith Trophy Defensive Player of the Year semifinalist list.

The pick was initially held by the Washington Wizards, who traded the rights to Jackson-Davis for cash considerations on draft night.

[30] On December 19, Jackson-Davis achieved his first double-double, recording 10 points, 13 rebounds and 3 blocks in a 132–126 overtime win against the Boston Celtics.

On April 4, Jackson-Davis recorded a career-high 20 points, combined with 5 rebounds and 4 assists in a 133–110 blowout win against the Houston Rockets.

He received the award not only for his athletic abilities, but also for his academic discipline in maintaining a B average, and his exemplary character in which he volunteered locally as a youth basketball coach and at the Wheeler Mission Center in Indianapolis, serving the homeless and those in need.