The 1984 United States presidential election in Utah took place on November 6, 1984. All 50 states and the District of Columbia, were part of the 1984 United States presidential election. State voters chose five electors to the Electoral College, which selected the president and vice president of the United States. Utah was won by incumbent United States President Ronald Reagan of California, who was running against former Vice President Walter Mondale of Minnesota. Reagan ran for a second time with incumbent Vice President and former C.I.A. Director George H. W. Bush of Texas, and Mondale ran with Representative Geraldine Ferraro of New York, the first major female candidate for the vice presidency.

Box Elder County is a county at the northwestern corner of Utah, United States. At the 2020 census, the population was 57,666, up from the 2010 figure of 49,975. Its county seat and largest city is Brigham City. The county was named for the box elder trees that abound in the county.