The average major salary at Knox County was $77,321 , which is 15 percent lower than the average salary for this job in Indiana, and 44 percent lower than the national average for this job . Major salaries at Knox County typically range from $75,544 to $79,097 (25th to 75th percentile). The highest reported major salary was $79,097. There are 2 employees at Knox County with the job title major.