 Under current projections, Wichita will not need another area code until after 2050.When most of area code 316 was moved to the new area code 620, all of Sedgwick County, home to Wichita, as well as portions of Butler, Kingman, Reno, Harvey and Sumner counties remained in area code 316.This area is largely coextensive with the Wichita metropolitan area.