Born: 27 February 1983, Bedford, New York, USA
Height: 5′ 3″ (1.60 m)
- Has older brother, Dan.
- Grew up in Bedford, New York.
- Granddaughter of Wellington Mara and Dan Rooney.
- Ranked #43 on the Maxim magazine Hot 100 of 2007 list.
- A skilled jazz/tap/ballet dancer.
- Her younger sister Rooney Mara is also an actress.
- New York Giants fan.
- Great-granddaughter of Art Rooney and Kathleen McNulty.
- Uncle John Mara is CEO of the New York Giants since 2005.
- Great-grandfather Tim Mara founded the New York Giants. Great-grandfather Art Rooney founded the Pittsburgh Steelers.
- Daughter of Timothy Christopher Mara, a scout for the New York Giants and Kathleen McNulty, née Rooney.
- Was in consideration for the role of Selina Kyle/Catwoman in The Dark Knight Rises (2012), but Anne Hathaway was cast instead.
- Kate and her sister Rooney Mara both appeared in Best Picture Oscar nominated films in 2011. Rooney was in The Social Network (2010), Kate in 127 Hours (2010).
- Her favorite films are Coal Miner’s Daughter (1980), The Sound of Music (1965), Lady Jane (1986), The English Patient (1996) and Friday Night Lights (2004).