Highest salary at Richland County in year 2017 was $128,959. Number of employees at Richland County in year 2017 was 79. Average annual salary was $35,146 and median salary was $34,177. Richland County average salary is 25 percent lower than USA average and median salary is 21 percent lower than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 3.2 percent, the median salary increased 1.4 percent.