Highest salary at Polk County in year 2023 was $163,400. Number of employees at Polk County in year 2023 was 144. Average annual salary was $28,673 and median salary was $31,186. Polk County average salary is 39 percent lower than USA average and median salary is 28 percent lower than USA median salary. From 2022 to 2023, the average salary of employees at this employer increased 4.2 percent.