Highest salary at O'Brien County in year 2023 was $122,386. Number of employees at O'Brien County in year 2023 was 135. Average annual salary was $46,616 and median salary was $57,374. O'Brien County average salary is 1 percent lower than USA average and median salary is 32 percent higher than USA median salary. From 2022 to 2023, the average salary of employees at this employer increased 14.0 percent, the median salary increased 8.2 percent.