Former President Donald Trump and Vice President Kamala Harris are nearly dead-even in Michigan headed into Election Day, according to polling averages, as at least five surveys over the past week show her with a slight advantage—but the race remains razor-thin in the three “blue wall” states that could solidify a win Tuesday for either candidate.

Ms. Harris made slight gains in Traverse City and its surrounding counties in northern Michigan, but Mr. Trump ultimately led in most of them. Ms. Harris gained only a few thousand votes in the region while Mr. Trump swept tens of thousands of votes elsewhere in the state.