Highest salary at Northbrook Sd 27 in year 2018 was $127,225. Number of employees at Northbrook Sd 27 in year 2018 was 81. Average annual salary was $37,186 and median salary was $30,431. Northbrook Sd 27 average salary is 21 percent lower than USA average and median salary is 30 percent lower than USA median salary. From 2017 to 2018, the median salary increased 6.8 percent.