- Is the youngest Grammy nominated songwriter.
- Is the co-founder and co-CEO of 3CG Records.
- Album "Underneath" debuted at # 1 on Billboard's Top Independent Albums chart. The album sold over 37K in its first week making it one of the most successful self-released albums of all time.
- Unlike his band mate brothers, he is the only one out of the trio who wasn't born in Tulsa, Oklahoma.
- Is good friends with Frankie Muniz.
- After nearly 3 years of fighting with their record label, Hanson has broke away from them and plan on releasing "Underneath" in September 2003. (May 2003)
- Brother of Isaac Hanson, Taylor Hanson, Jessica Grace 'Jessie', born on July 31, 1988, Avery Laurel, born on November 4, 1990, Joshua Mackenzie Mac Hanson, born on January 7, 1994 and Zoe Genevieve, born on January 14, 1998.
- Zac and his wife Kate have five children. John Ira "Shepherd" Hanson, born May 27, 2008, weighing 8 lbs. 4 oz, Junia Rosa Ruth, born December 15, 2010, weighing 8 lbs. 7 oz, George "Abraham" Walker, born October 17, 2013, weighing 8 lbs. 7 oz, Mary "Lucille" Diana, born August 6, 2016, weighing 8 lbs. 4 oz and Quincy Joseph Thoreau, born March 7, 2021.
- Member of Hanson.
- Son of Walker Hanson and Diana Hanson.
- Has four nephews and three nieces from his brother, Taylor Hanson and sister-in-law, Natalie. Jordan "Ezra" Hanson, born October 31, 2002, Penelope "Penny" Anne, born April 19, 2005, River Samuel, born September 4, 2006, Viggo Moriah, born December 9, 2008 and Wilhelmina "Willa" Jane, born October 2, 2012, Claude "Indiana" Emmanuel, born December 26, 2018 and Maybellene Alma Joy, born December 7, 2020.
- Has two nephews and one niece, from his brother, Isaac Hanson, and sister-in-law, Nikki. Clarke "Everett" Hanson, born April 3, 2007, James 'Monroe', born July 1, 2008 and Nina Odette, born March 11, 2014.
- Announced the start of own record label, 3CG Records, along with brothers Taylor and Isaac. The brothers, known as Hanson, will release their 3rd studio album, Underneath, on 3CG in spring 2004. (October 2003)
- On October 2, 2019, Zac was in a motorcycle accident near Tulsa, OK. He suffered three broken ribs, a broken clavicle, and a cracked scapula.
- Appears in the music video for Katy Perry's single, "Last Friday Night (T.G.I.F.)", alongside Rebecca Black, Darren Criss, Corey Feldman, Kenny G, Debbie Gibson, Kevin McHale, and his brothers, Isaac Hanson, and Taylor Hanson.
- Zac's wife, Kate, attended high school with his sister-in-law, Natalie Bryant.
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