The 1984 United States Senate election in New Jersey was held on November 6, 1984. Incumbent DemocratBill Bradley defeated Republican nominee Mary V. Mochary with 64.16% of the vote, winning every county in the state. To date, this is the most recent time Hunterdon, Sussex, and Warren counties were won by a Democrat in a statewide election. This was also the last time Morris County voted Democratic in a statewide election until 2020, where Senator Cory Booker won the county in his reelection and Joe Biden won the county in the 2020 presidential race.