Highest salary at Union County in year 2022 was $122,720. Number of employees at Union County in year 2022 was 921. Average annual salary was $27,664 and median salary was $22,167. Union County average salary is 41 percent lower than USA average and median salary is 49 percent lower than USA median salary. From 2021 to 2022, the average salary of employees at this employer increased 10.1 percent, the median salary increased 10.0 percent.