Highest salary at Union County in year 2019 was $207,846. Number of employees at Union County in year 2019 was 1,631. Average annual salary was $71,132 and median salary was $64,592. Union County average salary is 52 percent higher than USA average and median salary is 49 percent higher than USA median salary. From 2018 to 2019, the average salary of employees at this employer increased 3.9 percent, the median salary increased 4.0 percent.