Highest Mountain Grove employee salary in year 2017 was $50,596. Mountain Grove employees number in year 2017 was 51. Mountain Grove average salary was $27,947 and median salary was $27,594. According to the last payroll, Mountain Grove average salary is 63 percent lower than USA average and 42 percent lower than Missouri state average. Mountain Grove employee salaries are usually between $21,304 and $33,791. Top 10% of highest-earning employees have salaries ranging from $40,642 to $50,596.