Highest salary at Marion County in year 2020 was $124,177. Number of employees at Marion County in year 2020 was 266. Average annual salary was $36,014 and median salary was $40,755. Marion County average salary is 23 percent lower than USA average and median salary is 6 percent lower than USA median salary. From 2019 to 2020, the average salary of employees at this employer increased 2.5 percent, the median salary increased 2.9 percent.