Highest salary at Southside Isd in year 2017 was $237,400. Number of employees at Southside Isd in year 2017 was 674. Average annual salary was $50,444 and median salary was $52,475. Southside Isd average salary is 8 percent higher than USA average and median salary is 21 percent higher than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 11.3 percent, the median salary increased 1.6 percent.