 Except for minor adjustments, the names and boundaries of the historic districts remained largely unchanged from the 1870s until the 1990s, when the county was redistricted in order to equalize the area and population of its magisterial districts as nearly as possible.All of Grant District was combined with most of Ravenswood District to form the Northern Magisterial District.The southwestern portion of Ravenswood District was added to the new Western Magisterial District, although the city of Ravenswood remained in the Northern District.