Highest salary at Northbrook Sd 28 in year 2018 was $279,303. Number of employees at Northbrook Sd 28 in year 2018 was 563. Average annual salary was $42,790 and median salary was $24,823. Northbrook Sd 28 average salary is 9 percent lower than USA average and median salary is 43 percent lower than USA median salary. From 2017 to 2018, the average salary of employees at this employer increased 3.5 percent, the median salary increased 6.1 percent.