- Her grandmother, Eleanor Hennessy, was a huge influence in her early life. At fifteen, Jill began modeling in Toronto. Her grandmother drove her all over town.
- Her father, John, was a meat salesman, which required considerable travel and resulted in frequent moves. Her mother, Maxine, left the family when Jill was small. She also has a younger brother, John Jr.
- Described by Miguel Ferrer as being a non-angry version of her "Crossing Jordan" (2001) character Jordan Cavanaugh.
- Voted one of the "Fun and Fearless Females" by Cosmopolitan Magazine (2002.)
- Had a second marriage ceremony in January 2001 at New York City Hall with Rudolph W. Giuliani officiating.
- She used to busk (play the guitar and sing for money) in the New York City subway.
- Sometimes makes appearances at music events as a guest guitarist where she usually performs barefoot.
- She is such a fan of the folk duo The Indigo Girls that a poster of the act hangs in the kitchen set of her character in "Crossing Jordan" (2001).
- She and Paolo welcomed a son, Marco, on 17 September 2003.
- Finalist for role of Dana Scully on "The X Files" (1993).
- Speaks Italian, French, Spanish and German
- Has a song named after her: "The Ballad of Jill Hennessy" by Mollycuddle.
- Barely graduated from Kitchener, Ontario, Canada's Grand River Collegiate (high school), while her twin sister, Jacqueline Hennessy, has a Master's degree in French Literature.
- Her mother, Maxine, is a secretary in Montréal and a fantastic cook. Jill's father, John Paul Sr., is a meat salesman and a sales & marketing executive in Canada. She has a twin sister, Jacqueline Hennessy, who is an actress and a journalist, and a younger brother, John Paul Jr.
- Loves riding motorcycles with her husband.
- Has Irish, Italian, Swedish, French and Ukrainian ancestry.
- She loves to cook, and opened Hennessy's Tavern in Northvale, New Jersey in 1999. The Tavern serves "comfort food."
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