Highest salary at Gallatin County in year 2023 was $150,787. Number of employees at Gallatin County in year 2023 was 343. Average annual salary was $49,510 and median salary was $49,626. Gallatin County average salary is 6 percent higher than USA average and median salary is 14 percent higher than USA median salary. From 2022 to 2023, the average salary of employees at this employer increased 0.9 percent, the median salary increased 2.9 percent.