Highest salary at Collin County in year 2024 was $419,210. Number of employees at Collin County in year 2024 was 3,070. Average annual salary was $49,607 and median salary was $46,344. Collin County average salary is 6 percent higher than USA average and median salary is 7 percent higher than USA median salary. From 2023 to 2024, the average salary of employees at this employer increased 25.4 percent, the median salary increased 39.8 percent.