Patty Murray(D-WA) is now the longest serving female US Senator in history.

Patty Murray has been in the US Senate for 30 years 10 months. Her US Senate term does not end until 12/2028. 36 years.
Dianne Feinstein(CA) has been in the US Senate for 30 years 11 months.
Barbara Mikulski(MD) has been in the US Senate for 30 years.
Susan Collins(ME) has been in the US Senate for 26 years 9 months.
Barbara Boxer(CA) has been in the US Senate for 24 years.
Maria Cantwell(WA) has been in the US Senate for 23 years 9 months and is running for another term.
Debbie Stabenow(MI) has been in the US Senate for 23 years 9 months and is retiring.
Lisa Murkowski(AK) has been in the US Senate for 21 years.
Kay Bailey Hutchinson(TX) has been in the US Senate for 19 years.
Nancy Kassebaum(KS) has been in the US Senate for 18 years.
Mary Landreiu(LA) has been in the US Senate for 18 years.
Olympia Snowe(ME) has been in the US Senate for 18 years.
Amy Klobuchar(MN)
Jeanne Shaheen(NH)
Hattie Carraway(AR)
Blanche Lincoln(AR)
Claire McCaskill(MO)
Mazie Hirono(HI)
Elizabeth Warren(MA)
Deb Fischer(NE)
Tammy Baldwin(WI)
Joni Ernst(IA)
Shelly Moore Capito(WV)
Hillary Clinton(NY)
Maggie Hassan(NH)
Catherine Cortez Masto(NV)
Paula Hawkins(FL)
Carol Moseley Braun(IL)
Heidi Heitkamp(ND)
Tina Smith(MN)
Cindy Hyde Smith(MS)
Kyrsten Sinema(AZ)
Jacky Rosen(NV)
Cynthia Lummis(WY)
Katie Britt(AL)