Highest salary at St Clair County in year 2024 was $69,870. Number of employees at St Clair County in year 2024 was 97. Average annual salary was $30,214 and median salary was $33,542. St Clair County average salary is 36 percent lower than USA average and median salary is 23 percent lower than USA median salary. From 2023 to 2024, the average salary of employees at this employer increased 15.5 percent, the median salary increased 12.1 percent.