Highest salary at Jefferson County in year 2016 was $151,482. Number of employees at Jefferson County in year 2016 was 141. Average annual salary was $41,013 and median salary was $39,587. Jefferson County average salary is 12 percent lower than USA average and median salary is 9 percent lower than USA median salary. From 2015 to 2016, the average salary of employees at this employer increased 4.6 percent, the median salary increased 5.7 percent.