This list was taken from the 2009-2020 list available on American Library Association's website and can be found here.
I Know Why the Caged Bird Sings ~Maya Angelou
Restricted to students with parental permission at the Ocean View School District middle school libraries in Huntington Beach, CA because "the book's contents were inappropriate for children." Challenged in the Newman-Crows Landing, CA school district on a required reading list presented by the Orestimba High English Department. A trustee questioned the qualifications of Orestimba staff to teach a novel depicting African American culture.
The Absolutely True Diary
of a Part Time Indian ~Alexie, Sherman
Thorndike Press; Little
Retained on the summer reading list at Antioch, Ill.
High School (2009) despite objections from several parents who found its language vulgar and racist.
In response to concerns, however, the district will form a committee each March to review future summer reading assignments. The committee, which will include parents, would decide whether parents should be warned if a book contains possibly objectionable material. Source: Sept. 2009, p. 171.