Lee Harper's novel is an excellent depiction of small town southern life in the Depression era. Scout's gradual awareness of the race relations of her small Alabama town and the moral imperative to fight racial injustice is handled well.
I know this would normally not be considered a bildungsroman, but honestly Alice Walker's novel fits a lot of the criteria. Celie's movement from helplessness to her eventual awareness of herself as an independent woman is stunning. It will always be a classic.
Charles Dicken's depiction of Pip's struggles and determination to be more than a common laborer in order to win the hand of Estella is the classic rags to (somewhat) riches story. Pip's growth from youthful innocence and arrogance to matured sensitivity and sensibility is remarkable.