In 2020, Cortland County's streak of voting for the winner ended, as Donald Trump won for the second time, defeating Democratic nominee Joe Biden by a narrow margin of just 420 votes. Had the streak continued, it would have been tied with Clallam County, Washington for the longest active streak in the nation, as the streaks of longstanding bellwethers Valencia County, New Mexico and Vigo County, Indiana also ended in 2020. Cortland was one of five counties in the state that Trump carried by less than 500 votes.