1948 United States presidential election in New Jersey

The 1948 United States presidential election in New Jersey took place on November 2, 1948. All contemporary 48 states were part of the 1948 United States presidential election. Voters chose 16 electors to the Electoral College, which selected the president and vice president.

New Jersey was won by the Republican nominees, former Governor Thomas E. Dewey of New York and his running mate Governor Earl Warren of California. Dewey and Warren defeated the Democratic nominees, incumbent President Harry S. Truman of Missouri and his running mate Senator Alben W. Barkley of Kentucky. Also in the running was the Progressive Party candidate, former Democratic Vice President Henry A. Wallace, who ran with former Senator Glen H. Taylor of Idaho.

Dewey carried New Jersey with 50.33% of the vote to Truman's 45.93%, a margin of 4.39%. Wallace came in a distant third, with 2.19%.

Despite the closeness of the statewide result, Dewey won 15 of the state's 21 counties, while Truman won 6. However, Truman won several of the most heavily populated urban counties in the state, taking over 60% of the vote in Hudson County, winning majorities in Mercer, Camden, and Middlesex counties, and in rural Salem County, and winning with a plurality in Passaic County. However, Dewey won majorities in several heavily populated counties, including Bergen, Morris, Union, Monmouth, and Ocean counties, and also narrowly winning Essex County with a plurality, along with winning most of the state's Southern and rural counties. Wallace for his part performed most strongly in North Jersey, particularly in Essex, Union, and Passaic Counties.

New Jersey in this era was usually a swing state with a Republican lean, and its results in 1948 adhered to that pattern. As Truman narrowly defeated Dewey nationally in an upset victory, Dewey's narrow victory in New Jersey made the state almost 9% more Republican than the national average. Republicans won Burlington, Atlantic, Gloucester, and Cumberland counties for the first time since 1932. This is the last time Democrats won the presidency without Essex County. This is the second of 3 times that New Jersey voted for the loser of the presidential election in the 20th century, the other times being 1916 and 1976.