The 1964 United States Senate election in New Jersey was held on November 3, 1964. Incumbent Democrat Harrison A. Williams defeated Republican nominee Bernard M. Shanley with 61.91% of the vote. Primary elections were held on April 21, 1964. Both candidates were unopposed.
This was the first time since 1888 that Democrats were re-elected to the Senate from New Jersey, and the first since 1856 to this seat. This was the first time Democrats were popularly elected to a second term in the state.
Counties that flipped from Republican to Democratic