Highest salary at Massac County in year 2018 was $130,323. Number of employees at Massac County in year 2018 was 80. Average annual salary was $40,407 and median salary was $43,600. Massac County average salary is 14 percent lower than USA average and median salary is the same as USA median salary. From 2017 to 2018, the average salary of employees at this employer increased 8.7 percent, the median salary increased 9.1 percent.