Changes in State Delegation Party Majorities

Last Updated January 5, 2021

State delegations to the House vary greatly in size. Article I, Section II of the Constitution guarantees each state at least one Representative in the House; the total size of its delegation is determined by population. After the 2010 Census, the least populous states—Alaska, Delaware, Montana, North Dakota, South Dakota, Vermont, and Wyoming—were accorded one Representative each, while California, the most populous state, was accorded 53. 

The following PDF chart lists the last time that each state’s House delegation had a Democratic majority and a Republican majority. It also lists the last time, if any, that a state’s House delegation was composed entirely of Members of one party. The chart does not include statutory representatives from the territories or the District of Columbia.