Highest salary at Prosser in year 2016 was $153,663. Number of employees at Prosser in year 2016 was 380. Average annual salary was $46,869 and median salary was $42,661. Prosser average salary is the same as USA average and median salary is 2 percent lower than USA median salary. From 2015 to 2016, the average salary of employees at this employer increased 7.6 percent, the median salary increased 2.8 percent.