Highest salary at Knox County in year 2018 was $160,966. Number of employees at Knox County in year 2018 was 499. Average annual salary was $31,449 and median salary was $30,766. Knox County average salary is 33 percent lower than USA average and median salary is 29 percent lower than USA median salary. From 2017 to 2018, the average salary of employees at this employer increased 2.8 percent, the median salary increased 6.1 percent.