"This report presents a profile of the membership of the 115th Congress (2017-2018) as of November 13, 2017. Statistical information is included on selected characteristics of Members, including data on party affiliation, average age, occupation, education, length of congressional service, religious affiliation, gender, ethnicity, foreign births, and military service. In the House of Representatives, there are 242 Republicans (including 1 Delegate and the Resident Commissioner of Puerto Rico), 198 Democrats (including 4 Delegates), and 1 vacant seat. The Senate has 52 Republicans, 46 Democrats, and 2 Independents, who both caucus with the Democrats."
CRS Report for Congress, R44762
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html