CRS report via FAS – Membership of the 115th Congress: A Profile. Jennifer E. Manning, Senior Research Librarian, January 3, 2018: “This report presents a profile of the membership of the 115th Congress (2017-2018) as of January 3, 2018. 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 241 Republicans (including 1 Delegate and the Resident Commissioner of Puerto Rico), 197 Democrats (including 4 Delegates), and 3 vacant seats. The Senate has 51 Republicans, 47 Democrats, and 2 Independents, who both caucus with the Democrats.”