- Is in a relationship with another woman. (2004)
- Has been an on and off Broadway actress since 1980.
- Cynthia and long-time companion, photographer Danny Mozes, met in junior high school and were together from 1988 to 2003.
- Son Charles Ezekiel Mozes born 16 December 2002
- Naturally blonde.
- There is no TV in her house.
- In 1984, Nixon appeared in Amadeus.
- She appeared with Sarah Jessica Parker, her Sex and the City co-star, in the 1982 drama My Body, My Child.
- Her favorite shows are oldies such as All in the Family, MASH and Mary Tyler Moore.
- Enjoys pilates.
- Nominated for Best Performance by an Actress in a Supporting Role in a Series, Mini-Series or Motion Picture Made for Television at Golden Globe Awards for Sex and the City. (2004)
- Nominated for Best Performance by an Actress in a Supporting Role in a Series, Mini-Series or Motion Picture Made for Television for Sex and the City. (2003)
- Nominated for Outstanding Performance by an Ensemble in a Comedy Series at Screen Actors Guild Awards for Sex and the City. (2003)
- Nominated for Outstanding Supporting Actress in a Comedy Series at Emmy Awards for Sex and the City. (2003)
- Nominated for Outstanding Supporting Actress in a Comedy Series at Emmy Awards for Sex and the City. (2002)
- Nominated for Best Performance by an Actress in a Supporting Role in a Series, Mini-Series or Motion Picture Made for Television for Sex and the City. (2001)
- Nominated for Outstanding Performance by an Ensemble in a Comedy Series at Screen Actors Guild Awards for Sex and the City. (2001)
- Nominated for Best Performance by an Actress in a Supporting Role in a Series, Mini-Series or Motion Picture Made for Television for Sex and the City. (2000)
Quotes- "I think women should talk about sex. I think women should talk to each other about sex; I think they should talk to men about sex."
- "Motherhood is the only thing in my life that I've really known for sure is something I wanted to do."
- "I find the baby thing very, very easy. It's a no-brainer."
- "I'm fairly out of the loop when it comes to pop culture."
- "Married people are the enemy, they either pity you or they envy you. Marriage is something that can take you off your path."
- "Sex and The City has big fantasy elements, we're not trying to be role models. We look great so much of the time - we never have on the same outfit twice. But, frankly, most of my single friends complain endlessly that there are no men out there - so the idea that there's some fabulous guy round every corner is fantastical. It's a comedy! Who would take a social satire literally? Did anyone take Charlie's Angels literally?"
Awards- Emmy Awards: Outstanding Supporting Actress in a Comedy Series, Sex and the City (2004)
- Screen Actors Guild Awards: Outstanding Performance by an Ensemble in a Comedy Series, Sex and the City (2004)
- Screen Actors Guild Awards: Outstanding Performance by an Ensemble in a Comedy Series, Sex and the City (2002)
- Women in Film Lucy Awards: Lucy Award (1999)
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