Highest salary at Piatt County in year 2020 was $129,120. Number of employees at Piatt County in year 2020 was 325. Average annual salary was $33,365 and median salary was $32,500. Piatt County average salary is 29 percent lower than USA average and median salary is 25 percent lower than USA median salary. From 2019 to 2020, the average salary of employees at this employer increased 23.7 percent, the median salary increased 28.4 percent.