Highest salary at Polk County in year 2023 was $75,610. Number of employees at Polk County in year 2023 was 85. Average annual salary was $28,106 and median salary was $29,760. Polk County average salary is 40 percent lower than USA average and median salary is 32 percent lower than USA median salary. From 2022 to 2023, the median salary increased 15.7 percent.