Highest salary at Franklin County in year 2018 was $154,149. Number of employees at Franklin County in year 2018 was 192. Average annual salary was $37,732 and median salary was $37,907. Franklin County average salary is 19 percent lower than USA average and median salary is 13 percent lower than USA median salary. From 2017 to 2018, the median salary increased 2.6 percent.