Highest salary at Clay County in year 2016 was $623,124. Number of employees at Clay County in year 2016 was 438. Average annual salary was $38,449 and median salary was $31,099. Clay County average salary is 18 percent lower than USA average and median salary is 28 percent lower than USA median salary. From 2015 to 2016, the average salary of employees at this employer increased 8.4 percent, the median salary increased 8.1 percent.