Highest salary at Southwest Isd in year 2017 was $232,841. Number of employees at Southwest Isd in year 2017 was 1,937. Average annual salary was $46,231 and median salary was $54,325. Southwest Isd average salary is 1 percent lower than USA average and median salary is 25 percent higher than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 3.4 percent, the median salary increased 3.3 percent.