Highest salary at Massac Usd 1 in year 2016 was $142,246. Number of employees at Massac Usd 1 in year 2016 was 197. Average annual salary was $50,044 and median salary was $53,441. Massac Usd 1 average salary is 7 percent higher than USA average and median salary is 23 percent higher than USA median salary. From 2015 to 2016, the average salary of employees at this employer increased 6.7 percent, the median salary increased 2.8 percent.