Highest salary at City Of Gretna in year 2016 was $124,035. Number of employees at City Of Gretna in year 2016 was 21. Average annual salary was $33,258 and median salary was $29,622. City Of Gretna average salary is 29 percent lower than USA average and median salary is 32 percent lower than USA median salary. From 2015 to 2016, the average salary of employees at this employer increased 18.4 percent, the median salary increased 19.5 percent.