Highest salary at Oliver County in year 2021 was $62,211. Number of employees at Oliver County in year 2021 was 46. Average annual salary was $22,041 and median salary was $22,722. Oliver County average salary is 53 percent lower than USA average and median salary is 48 percent lower than USA median salary. From 2020 to 2021, the average salary of employees at this employer increased 5.6 percent, the median salary increased 1.5 percent.