Highest salary at Merrimack County in year 2022 was $157,641. Number of employees at Merrimack County in year 2022 was 562. Average annual salary was $52,101 and median salary was $52,038. Merrimack County average salary is 11 percent higher than USA average and median salary is 20 percent higher than USA median salary. From 2021 to 2022, the average salary of employees at this employer increased 22.2 percent, the median salary increased 17.4 percent.