Highest salary at Nassau County in year 2023 was $214,159. Number of employees at Nassau County in year 2023 was 505. Average annual salary was $60,147 and median salary was $53,143. Nassau County average salary is 28 percent higher than USA average and median salary is 22 percent higher than USA median salary. From 2022 to 2023, the average salary of employees at this employer increased 8.6 percent, the median salary increased 9.4 percent.