- Has served as a board member of the Rape Treatment Center at UCLA Medical Center and co-narrated a documentary on campus rape with her L.A. Law (1986) co-star Corbin Bernsen.
- According to Shirley Jones' autobiography, Susan is the only star of The Partridge Family (1970) who has consistently refused to take part in any cast reunions.
- Came to acting by way of a teen modeling career.
- Turned down the role of Sandy in Grease (1978).
- One of four children, Susan's sister Leslie became a model too just like her sister and the sisters at one time worked for the same agency. The girls became interested in modeling through their stepmother, Gail, who, after reading an article on fashion modeling in Seventeen Magazine, submitted their pictures to a top modeling agency in New York. The agency immediately signed them in 1968.
- Olivia Newton-John got the part that had originally been meant for Susan Dey, who was Laurie Partridge in The Partridge Family (1970), but turned it down on her manager's advice.
- Born to Robert Smith Dey (a newspaper editor) and Ruth Dey(a nurse), Susan attended school mostly in New York State, where her father was an editor for a group of newspapers on Long Island.
- Currently resides Upstate New York (November 2017).
- Mother, with Leonard Hirshan, of daughter Sara Dey-Hirshan, born in November 1978.
- In Gwyn Cready's comedic romance novel "Tumbling Through Time", the heroine talks about Susan and considers Laurie Partridge a personal hero, wishing she could have lived a life in "Laurie Partridge style".
- Graduated from and was a drama club member of Fox Lane High School in Bedford, New York. She had parts in the school plays "Arsenic and Old Lace" and "Summer and Smoke".
- Ranked #61 on Vh1's 100 Greatest Teen Stars.
- Was considered for the role of Elvira Hancock in Scarface (1983) but Michelle Pfeiffer got the part.
- Born at 4:17 AM (CST).
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