Highest salary at County Of Napa in year 2016 was $257,223. Number of employees at County Of Napa in year 2016 was 1,344. Average annual salary was $74,268 and median salary was $67,943. County Of Napa average salary is 58 percent higher than USA average and median salary is 56 percent higher than USA median salary. From 2015 to 2016, the average salary of employees at this employer increased 3.8 percent, the median salary increased 1.7 percent.