Highest salary at County Of Gregg in year 2018 was $158,000. Number of employees at County Of Gregg in year 2018 was 744. Average annual salary was $33,097 and median salary was $34,134. County Of Gregg average salary is 29 percent lower than USA average and median salary is 22 percent lower than USA median salary. From 2017 to 2018, the median salary increased 2.5 percent.