washtenaw_county,_michigan | country | united_states <tsp> michigan | language | english_language <tsp> ann_arbor,_michigan | ispartof | washtenaw_county,_michigan <tsp> michigan | capital | lansing,_michigan <tsp> ann_arbor,_michigan | ispartof | michigan <sep> washtenaw county ( wash-tə-naw) is a county located in the us state of michigan at the 2020 census, the population was 372,258 the county seat is ann arbor the county was authorized by legislation in 1822 and organized as a county in 1826 
ann arbor is part of washtenaw county. michigan. united states. lansing is the capital of the state and the language spoken is english.washtenaw county michigan michigan michigan at the 2020 census had a population of 372,258