Marshfield is in Plymouth County as part of the ninth congressional district of Massachusetts and the State Senate District of Plymouth and Norfolk. The change occurred at the state representative level. The town is now divided in half, with the northern precincts being represented by Patrick Kearney of the fourth Plymouth( Precincts 1-3, 5-7), and the southern district being represented by Josh Cutler of the sixth Plymouth (Precincts 2A and 4).