Highest salary at Massac County in year 2021 was $140,295. Number of employees at Massac County in year 2021 was 82. Average annual salary was $44,027 and median salary was $47,134. Massac County average salary is 6 percent lower than USA average and median salary is 8 percent higher than USA median salary. From 2020 to 2021, the average salary of employees at this employer increased 5.2 percent, the median salary increased 3.3 percent.