Highest salary at Sussex County in year 2018 was $180,000. Number of employees at Sussex County in year 2018 was 504. Average annual salary was $54,680 and median salary was $46,392. Sussex County average salary is 17 percent higher than USA average and median salary is 7 percent higher than USA median salary. From 2017 to 2018, the average salary of employees at this employer increased 0.6 percent.