Highest salary at Marion County in year 2017 was $148,242. Number of employees at Marion County in year 2017 was 145. Average annual salary was $36,235 and median salary was $34,492. Marion County average salary is 23 percent lower than USA average and median salary is 21 percent lower than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 3.8 percent, the median salary increased 5.3 percent.