Highest salary at Hadley in year 2013 was $55,661. Number of employees at Hadley in year 2013 was 26. Average annual salary was $31,950 and median salary was $41,932. Hadley average salary is 32 percent lower than USA average and median salary is 4 percent lower than USA median salary. From 2012 to 2013, the median salary increased 0.7 percent.