Highest salary at McHenry County in year 2021 was $75,096. Number of employees at McHenry County in year 2021 was 26. Average annual salary was $36,000 and median salary was $40,182. McHenry County average salary is 23 percent lower than USA average and median salary is 8 percent lower than USA median salary. From 2020 to 2021, the average salary of employees at this employer increased 38.2 percent, the median salary increased 32.6 percent.