Highest salary at Williamsville in year 2012 was $69,601. Number of employees at Williamsville in year 2012 was 23. Average annual salary was $35,390 and median salary was $37,395. Williamsville average salary is 24 percent lower than USA average and median salary is 14 percent lower than USA median salary. From 2011 to 2012, the average salary of employees at this employer increased 25.0 percent, the median salary increased 19.7 percent.