Highest salary at McLennan County in year 2021 was $184,411. Number of employees at McLennan County in year 2021 was 1,521. Average annual salary was $38,753 and median salary was $44,700. McLennan County average salary is 17 percent lower than USA average and median salary is 3 percent higher than USA median salary. From 2020 to 2021, the average salary of employees at this employer increased 16.7 percent, the median salary increased 14.2 percent.