Highest salary at City Of Marengo in year 2017 was $99,760. Number of employees at City Of Marengo in year 2017 was 18. Average annual salary was $61,115 and median salary was $60,720. City Of Marengo average salary is 30 percent higher than USA average and median salary is 40 percent higher than USA median salary. From 2016 to 2017, the median salary increased 3.1 percent.