Highest salary at Glenbrook Sd 225 in year 2017 was $131,263. Number of employees at Glenbrook Sd 225 in year 2017 was 376. Average annual salary was $38,151 and median salary was $34,655. Glenbrook Sd 225 average salary is 19 percent lower than USA average and median salary is 20 percent lower than USA median salary. From 2016 to 2017, the average salary of employees at this employer increased 1.4 percent, the median salary increased 0.2 percent.