Highest salary at Johnson County in year 2022 was $143,832. Number of employees at Johnson County in year 2022 was 77. Average annual salary was $36,516 and median salary was $37,050. Johnson County average salary is 22 percent lower than USA average and median salary is 15 percent lower than USA median salary. From 2021 to 2022, the average salary of employees at this employer increased 16.2 percent, the median salary increased 19.4 percent.