Highest salary at Lewis County in year 2017 was $265,000. Number of employees at Lewis County in year 2017 was 924. Average annual salary was $40,403 and median salary was $37,243. Lewis County average salary is 14 percent lower than USA average and median salary is 14 percent lower than USA median salary. From 2016 to 2017, the median salary increased 0.5 percent.