All 80 seats in the General Assembly were up for election this year. In each Legislative district, there are two people elected; the top two winners in the general election are the ones sent to the Assembly. Typically, the two members of each party run as a team in each election. After the previous election, Democrats captured 47 seats while the Republicans won 33 seats. These were the first elections to be held after the 2010 redistricting cycle.
Democrats gained one seat, by flipping a seat in the 4th district, which they had only lost two years prior.
Summary of the November 8, 2011 New Jersey General Assembly election results:
Districts where the difference of total votes between the top-two parties was under 10%:
Voters in each legislative district elect two members to the New Jersey General Assembly.
|- style="background-color:#F6F6F6" ! style="background-color: <nowiki>#3333FF</nowiki>" | | colspan="6" | One Democratic gain from Republican |-