Highest salary at Union County in year 2020 was $212,003. Number of employees at Union County in year 2020 was 1,591. Average annual salary was $74,234 and median salary was $68,548. Union County average salary is 58 percent higher than USA average and median salary is 58 percent higher than USA median salary. From 2019 to 2020, the average salary of employees at this employer increased 4.4 percent, the median salary increased 6.1 percent.