Highest salary at Union County in year 2023 was $111,689. Number of employees at Union County in year 2023 was 741. Average annual salary was $36,764 and median salary was $35,028. Union County average salary is 22 percent lower than USA average and median salary is 19 percent lower than USA median salary. From 2022 to 2023, the average salary of employees at this employer increased 32.9 percent.