Highest salary at Johnson County in year 2023 was $149,847. Number of employees at Johnson County in year 2023 was 79. Average annual salary was $38,606 and median salary was $39,000. Johnson County average salary is 18 percent lower than USA average and median salary is 10 percent lower than USA median salary. From 2022 to 2023, the average salary of employees at this employer increased 5.7 percent, the median salary increased 5.3 percent.