The high number of Asian business owners, as well as conservative-leaning individuals in Rowland Heights, makes it an area with relatively strong Republican support. In 2018, there are more voters in the district registered as Republicans than Democrats. In the California State Senate, Rowland Heights is located in California's 29th State Senate district, which is represented by Democrat Josh Newman. However, following the recall election as part of the 2018 California Primaries, Newman was recalled from the state Senate largely because he voted for an unpopular gasoline tax increase after promising he would hold the line on taxes. Ling Ling Chang, his original opponent and a Republican, won the election to replace Newman in the state Senate. Newman's loss ended the Democratic supermajority in the California State Senate.