Highest salary at County Of Napa in year 2017 was $250,153. Number of employees at County Of Napa in year 2017 was 1,398. Average annual salary was $80,053 and median salary was $73,531. County Of Napa average salary is 71 percent higher than USA average and median salary is 69 percent higher than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 7.8 percent, the median salary increased 8.2 percent.