 Newton County was renamed as St. Louis County and had that eastern area added to it; it was also expanded westward by incorporating parts of Itasca County, which then also included most of Carlton County.On May 23, 1857, St. Louis County took its current shape when Carlton County was formed from parts of St. Louis and Pine counties.According to the U.S. Census Bureau, the county has a total area of , of which is land and (8.9%) is water.