Highest salary at Lewis County in year 2018 was $270,000. Number of employees at Lewis County in year 2018 was 985. Average annual salary was $39,903 and median salary was $37,882. Lewis County average salary is 15 percent lower than USA average and median salary is 13 percent lower than USA median salary. From 2017 to 2018, the median salary increased 1.7 percent.