The average secretary salary at Napa County was $95,200 , which is 13 percent higher than the average salary for this job in California, and 36 percent higher than the national average for this job . Secretary salaries at Napa County typically range from $95,756 to $108,050 (25th to 75th percentile). The highest reported secretary salary was $111,719. There are 6 employees at Napa County with the job title secretary.