Highest salary at Franklin County in year 2020 was $144,232. Number of employees at Franklin County in year 2020 was 739. Average annual salary was $35,441 and median salary was $39,223. Franklin County average salary is 24 percent lower than USA average and median salary is 10 percent lower than USA median salary. From 2019 to 2020, the median salary increased 0.8 percent.