Highest salary at Gallatin County in year 2020 was $136,584. Number of employees at Gallatin County in year 2020 was 25. Average annual salary was $41,907 and median salary was $38,878. Gallatin County average salary is 11 percent lower than USA average and median salary is 11 percent lower than USA median salary. From 2019 to 2020, the average salary of employees at this employer increased 22.4 percent, the median salary increased 31.3 percent.