Highest salary at Hadley in year 2011 was $54,299. Number of employees at Hadley in year 2011 was 22. Average annual salary was $33,730 and median salary was $41,756. Hadley average salary is 28 percent lower than USA average and median salary is 4 percent lower than USA median salary. From 2010 to 2011, the median salary increased 5.8 percent.