The 13th Delaware General Assembly was a meeting of the legislative branch of the state government, consisting of the Delaware Legislative Council and the Delaware House of Assembly. Elections were held the first day of October and terms began on the twentieth day of October. It met in Dover, Delaware, convening October 20, 1788, and was the third year of the administration of President Thomas Collins. He died March 29, 1789, and was replaced by President Jehu Davis.
The apportionment of seats was permanently assigned to three councilors and seven assemblymen for each of the three counties. Population of the county did not effect the number of delegates.
Councilors were elected by the public for a three-year term, one third posted each year.
Assemblymen were elected by the public for a one-year term.