Highest salary at Plains Isd in year 2017 was $130,600. Number of employees at Plains Isd in year 2017 was 81. Average annual salary was $42,169 and median salary was $44,000. Plains Isd average salary is 10 percent lower than USA average and median salary is 1 percent higher than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 4.8 percent, the median salary increased 6.9 percent.