Highest salary at Knox County in year 2017 was $165,102. Number of employees at Knox County in year 2017 was 501. Average annual salary was $30,597 and median salary was $29,007. Knox County average salary is 35 percent lower than USA average and median salary is 33 percent lower than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 4.8 percent, the median salary increased 2.0 percent.