Highest salary at Boone County in year 2020 was $120,223. Number of employees at Boone County in year 2020 was 194. Average annual salary was $37,661 and median salary was $43,952. Boone County average salary is 20 percent lower than USA average and median salary is 1 percent higher than USA median salary. From 2019 to 2020, the median salary increased 2.0 percent.