Highest salary at Seneca County in year 2017 was $177,717. Number of employees at Seneca County in year 2017 was 495. Average annual salary was $37,521 and median salary was $39,134. Seneca County average salary is 20 percent lower than USA average and median salary is 10 percent lower than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 2.3 percent.