Highest Middlesex employee salary in year 2022 was $58,236. Middlesex employees number in year 2022 was 12. Middlesex average salary was $25,559 and median salary was $18,552. According to the last payroll, Middlesex average salary is 66 percent lower than USA average and 56 percent lower than New York state average. Middlesex employee salaries are usually between $5,108 and $44,518. Top 10% of highest-earning employees have salaries ranging from $55,567 to $58,236.