The 114th United States Congress began on January 3, 2015. There were 13 new senators (one Democrat, 12 Republicans) and 59 new representatives (15 Democrats, 44 Republicans), as well as two new delegates (one Democrat, one Republican), at the start of its first session. Additionally, seven representatives (two Democrats, five Republicans) took office on various dates in order to fill vacancies during the 114th Congress before it ended on January 3, 2017.
The president of the House Democratic freshman class was Ted Lieu of California, while the president of the House Republican freshman class was Ken Buck of Colorado. Additionally, the Republican's freshmen liaison was Mimi Walters of California.