Highest salary at Madison County in year 2020 was $141,301. Number of employees at Madison County in year 2020 was 324. Average annual salary was $26,889 and median salary was $28,192. Madison County average salary is 43 percent lower than USA average and median salary is 35 percent lower than USA median salary. From 2019 to 2020, the average salary of employees at this employer increased 8.0 percent, the median salary increased 15.4 percent.