- Sullivan grew up in Tuscaloosa, Alabama.
- "Cost of Living," the play in which Katy Sullivan originated the role of Ani, won the 2018 Pulitzer Prize for Drama.
- Ran in the London 2012 Paralympics Games.
- Katy Sullivan was nominated for a 2017-2018 Outer Critics Circle Award for Outstanding Actress in a Play (for "Cost of Living"). Her fellow nominees were: MaameYaa Boafo in "School Girls; Or, the African Mean Girls Play"; Jessica Hecht in "Admissions"; Glenda Jackson in "Three Tall Women"; and Lauren Ridloff in "Children of a Lesser God." Jackson was the winner in their category.
- Katy Sullivan was nominated for a 2018 Lucille Lortel Award for Outstanding Featured Actress in a Play (for "Cost of Living"). Her fellow nominees were: Vanessa Aspillaga in "Amy and the Orphans"; Quincy Tyler Bernstine in "As You Like It"; Liza Colón-Zayas in "Mary Jane"; and Mirirai Sithole in "School Girls; Or, the African Mean Girls Play." Sithole was the winner in their category.
- Received a BFA in acting from Webster University's Conservatory in St Louis, Missouri.
- Katy Sullivan was nominated for a 2023 Tony Award for Best Performance by an Actress in a Featured Role in a Play (for Cost of Living). Her fellow nominees were: Nikki Crawford (for Fat Ham), Crystal Lucas-Perry (for Ain't No Mo'), Miriam Silverman ( for The Sign in Sidney Brustein's Window, and her Cost of Living costar Kara Young.
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