Wisconsin State Assembly

The Wisconsin State Assembly is the lower house of the Wisconsin Legislature. Together with the smaller Wisconsin Senate, the two constitute the legislative branch of the U.S. state of Wisconsin.

Representatives are elected for two-year terms, elected during the fall elections. If a vacancy occurs in an Assembly seat between elections, it may be filled only by a special election.

The Wisconsin Constitution limits the size of the State Assembly to between 54 and 100 members inclusive. Since 1973, the state has been divided into 99 Assembly districts apportioned amongst the state based on population as determined by the decennial census, for a total of 99 representatives. From 1848 to 1853 there were 66 assembly districts; from 1854 to 1856, 82 districts; from 1857 to 1861, 97 districts; and from 1862 to 1972, 100 districts. The size of the Wisconsin State Senate is tied to the size of the Assembly; it must be between one-fourth and one-third the size of the Assembly. Presently, the Senate has 33 members, with each Senate district formed by combining three neighboring Assembly districts.

The Assembly is heavily gerrymandered, with a 53–45% Democratic majority in the popular vote in the 2018 election translating into a 63–36 Republican majority in the Assembly. According to the Oshkosh Northwestern, many experts recognize Wisconsin as the most gerrymandered state in the United States, a claim rated "Mostly True" by Politifact. After the Republican redistricting in 2021, the Wisconsin Center for Investigative Journalism reported the efficiency gap had further increased to 16.6% in favor of Republicans.

On December 22, 2023, the Wisconsin Supreme Court ruled in Clarke v. Wisconsin Elections Commission that the gerrymandered districts were unconstitutional and must be redrawn before the 2024 legislative elections.

The Assembly chamber is located in the west wing of the Wisconsin State Capitol building, in Madison, Wisconsin.