June 2021 breakdown of state legislative party membership: 54.33% Republicans, 44.87% Democrats

According to Ballotpedia’s June partisan count of the 7,383 state legislators across the United States, 54.33% of all state legislators are Republicans, and 44.87% are Democrats.

Ballotpedia tallies the partisan balance of state legislatures at the end of every month. This refers to which political party holds the majority of seats in each chamber. Republicans control 61 chambers, while Democrats hold 37. The Alaska House of Representatives is the only chamber to be organized under a multipartisan, power-sharing coalition.

Nationally, the state legislatures include 1,966 state senators and 5,397 state representatives. Democrats hold 867 state Senate seats—the same as last month—and 2,446 state House seats, a loss of four. Republicans hold 4,011 of the 7,383 state legislative seats—1,092 state Senate seats (up one since May) and 2,919 state House seats, also an increase of one. Independent or third-party legislators hold 39 seats, of which 32 are state House seats, and seven are state Senate seats. There are 20 vacant seats.

During the month of June, Democrats saw a net decrease of four seats, while Republicans saw a net increase of two seats. Compared to June of last year, the state legislatures are 1.95% less Democratic (46.82% to 44.87%) and 2.17% more Republican (52.16% to 54.33%).  

Additional reading:

State legislative vacancies, 2021

Partisan composition of state houses

State senators

State representatives