Highest salary at Merkel Isd in year 2017 was $114,500. Number of employees at Merkel Isd in year 2017 was 197. Average annual salary was $37,897 and median salary was $40,753. Merkel Isd average salary is 19 percent lower than USA average and median salary is 6 percent lower than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 6.7 percent, the median salary increased 16.3 percent.