It has been represented by Democrat Darrin Camilleri since 2023, succeeding fellow Democrat Marshall Bullock.

[2][3][4] District 4 encompasses part of Wayne County.

[5] District 4, as dictated by the 2011 Apportionment Plan, was based in central Detroit in Wayne County, also covering the nearby communities of Allen Park, Lincoln Park, and Southgate.

[7] At just over 47 square miles, it was the smallest Senate district in the state.

[8] In March 2016, incumbent Virgil Smith Jr. resigned after being sentenced to prison for shooting up his wife's car, and a special election was called to fill the seat.