Highest salary at Hadley in year 2012 was $54,570. Number of employees at Hadley in year 2012 was 23. Average annual salary was $34,381 and median salary was $41,662. Hadley average salary is 27 percent lower than USA average and median salary is 4 percent lower than USA median salary. From 2011 to 2012, the average salary of employees at this employer increased 1.9 percent.