Women in the U.S. Senate 2016. Twenty women (14D, 6R) serve in the United States Senate in the 114th Congress. women have ever served in the Senate, including 29 Democrats and 17 Republicans. states (LA, ME, NE) have sent three women to the Senate. California was the first state to send two women (Boxer (D) and Feinstein (D)) to the Senate simultaneously.