Elections to the United States House of Representatives in New Jersey for the 6th Congress were held October 10, 1798.
All previous elections had been held on an at-large basis. Five Federalists had been elected in the previous election. For this election, New Jersey switched, for the first time, to using districts.
Three incumbents ran for re-election, of whom, two of whom lost to Democratic-Republicans. The incumbents Jonathan Dayton (F) and Thomas Sinnickson (F) did not run for re-election. In the districts with no incumbents, one was won by a Democratic-Republican and the other by a Federalist, for a net gain of 3 seats by the Democratic-Republicans