Highest salary at Massac County in year 2020 was $136,979. Number of employees at Massac County in year 2020 was 81. Average annual salary was $41,845 and median salary was $45,627. Massac County average salary is 11 percent lower than USA average and median salary is 5 percent higher than USA median salary. From 2019 to 2020, the average salary of employees at this employer increased 6.5 percent, the median salary increased 4.2 percent.