November 6, 1984 | |||||||||||||||||
| |||||||||||||||||
Castle: 50–60% 60–70% 70–80% Quillen: 50–60% 60–70% 80–90% | |||||||||||||||||
| |||||||||||||||||
The 1984 Delaware gubernatorial election took place on November 6, 1984. Incumbent Republican governor Pierre S. duPont IV was barred from seeking a third term in office. Lieutenant Governor Mike Castle was elected to succeed him, defeating State Supreme Court Justice William T. Quillen.
This was the last time that a gubernatorial nominee and a lieutenant gubernatorial nominee of different political parties were elected simultaneously in Delaware.
| Party | Candidate | Votes | % | ±% | |
|---|---|---|---|---|---|
| Republican | Mike Castle | 135,250 | 55.53% | ||
| Democratic | William T. Quillen | 108,315 | 44.47% | ||
| Republican hold | Swing | ||||
| County | Mike Castle Republican | William Quillen Democratic | ||
|---|---|---|---|---|
| # | % | # | % | |
| Kent | 17,894 | 55.7% | 14,234 | 44.3% |
| New Castle | 93,393 | 54.5% | 77,866 | 45.5% |
| Sussex | 23,963 | 59.6% | 16,215 | 40.4% |
| Totals | 132,250 | 55.0% | 108,315 | 45.0% |