Steve Berkowitz and Jodi Upton report that Kiffin's 2010 salary of $1.5 million was the highest in the NCAA, and following his resignation after USC's Sun Bowl game, Clemson offensive coordinator Chad Morris and his reported $1.3 million salary will be the highest in the nation.
Salary data from 2010 is the most recent that is available for the public.
USA Today reports that the average college football assistant coaching salaries for high-major coaches is approximately $200,000.
The salaries of Morris and Kiffin are each higher than the majority of FBS head coaches for the 2012 season. Eight assistants in the nation make at least $800,000, according to the survey.
Other highly-paid assistants include Alabama's Kirby Smart ($950,000), LSU's John Chavis ($911,250), Auburn's Brian VanGorder ($875,000) and Georgia's Todd Grantham ($825,000), according to USA Today.