Highest salary at Union County in year 2020 was $203,268. Number of employees at Union County in year 2020 was 1,410. Average annual salary was $47,906 and median salary was $47,502. Union County average salary is 2 percent higher than USA average and median salary is 9 percent higher than USA median salary. From 2019 to 2020, the average salary of employees at this employer increased 7.0 percent, the median salary increased 4.7 percent.