Highest salary at Massac County in year 2019 was $133,233. Number of employees at Massac County in year 2019 was 84. Average annual salary was $39,283 and median salary was $43,803. Massac County average salary is 16 percent lower than USA average and median salary is 1 percent higher than USA median salary. From 2018 to 2019, the median salary increased 0.5 percent.