The oldest unit of government in Genesee County, Grand Blanc Township was organized on March 9, 1833 by the Territory of Michigan. Then the township included the survey area of the future townships of Atlas, Burton, Davison, Fenton, Flint, Genesee, Mount Morris and Mundy. With the March 2, 1836 formation of Flint Township, Grand Blanc lost in addition the township survey areas of Burton, Genesee and Mount Morris to Flint. With the July 26, 1836 organization of Argentine Township, Grand Blanc lost Fenton to the new township. Mundy was split off on its March 11, 1837 organization. By March 1843, Atlas and Davison had been organized.