Highest salary at Cass County in year 2018 was $299,531. Number of employees at Cass County in year 2018 was 135. Average annual salary was $38,996 and median salary was $31,353. Cass County average salary is 17 percent lower than USA average and median salary is 28 percent lower than USA median salary. From 2017 to 2018, the average salary of employees at this employer increased 3.6 percent, the median salary increased 2.4 percent.