Highest salary at Massac County in year 2016 was $128,959. Number of employees at Massac County in year 2016 was 77. Average annual salary was $41,006 and median salary was $42,435. Massac County average salary is 13 percent lower than USA average and median salary is 2 percent lower than USA median salary. From 2015 to 2016, the average salary of employees at this employer increased 9.4 percent, the median salary increased 6.6 percent.