Highest salary at Grundy County in year 2016 was $166,508. Number of employees at Grundy County in year 2016 was 202. Average annual salary was $51,743 and median salary was $46,582. Grundy County average salary is 10 percent higher than USA average and median salary is 7 percent higher than USA median salary. From 2015 to 2016, the average salary of employees at this employer increased 9.0 percent, the median salary increased 19.8 percent.