The presidential election of 1984 was a very partisan election for Delaware, with over 99% of the electorate voting either Democratic or Republican, though 6 parties appeared on the ballot.[1] All three of Delaware's counties gave Reagan an outright majority.
Reagan won Delaware by just shy of 20%, which made Delaware about 1% more Republican than the nation at large. His strongest county was Sussex County, Delaware's southernmost county, where he received over 2/3 of the vote. He also received over 60% in Delaware's middle county, Kent County. In New Castle County, Delaware's northernmost and most populous county, Reagan won by double digits, but was held to a 14.5% margin, discernibly less than his national margin.