The first french explorers and missionaries came to the area that would later be known as chesterfield township around 1611, naming the dominant waterway luc sainte claire. the first purchase of government land was made by fabian robertjean on august 20, 1820, in section 11, near new baltimore's washington street. in 1842, via public act 57, the michigan state legislature officially created the charter township of chesterfield. chesterfield is nestled between two old michigan cities, new baltimore and mt. clemens. the history of the township is closely aligned with these two cities, especially new baltimore, with whom it has shared a post office from the time the new baltimore post office was established in 1851 as ashleyville (named for founder alfred ashley) and given its current name in 1855. new baltimore was a part of chesterfield until 1931, when it "seceded" from the township.