 sunfield township is a civil township of eaton county in the u.s. state of michigan. the population was 2,177 at the 2000 census. == communities == * the village of sunfield is the only incorporated municipality within the township. * bismark was a post office in the southern part of the township. brothers silas p. and j. hatch loomis emigrated here in 1835. a post office named bismark was established on january 26, 1871, with hatch j. loomis as the first postmaster, and operated until june 30, 1904.{{cite gnis|2574838|bismarck post office (histori
Lansing_a_East_Lansing_metropolitan_area Townships_in_Eaton_County,_Michigan Townships_in_Michigan