Women in Congress, 1917-2018: Service Dates and Committee Assignments by Member, and Lists by State and Congress [March 19, 2018] [open pdf - 1MB]
"On November 9, 1916, Jeannette Rankin (R-MT) was elected to the House of Representatives as Montana's Representative-at-Large to the 65th Congress (1917-1919). This election win gave Representative Rankin the distinction of being the first woman elected to serve in Congress. The first woman to serve in the Senate was Rebecca Latimer Felton (D-GA). She was appointed in 1922 and served for one day. Including new Members sworn into office in January 2018,2 327 women have been elected or appointed to Congress.3 These figures include six non-voting Delegates, one each from Guam, Hawaii, the District of Columbia, and American Samoa, and two from the U.S. Virgin Islands, as well as one Resident Commissioner from Puerto Rico."
CRS Report for Congress, RL30261