[a_shovel]

The source says it was banned in 1978. I suspect that the ban may not still be in effect.

[scarmig]

It'd be interesting to see what books each school library makes available to confirm; I'm not aware of a way to find that information.

Slightly different, but more recently in Burbank several other books were banned from being included in curricula amid parent outcry:

https://abc7news.com/to-kill-a-mockingbird-ban-book-bank-bur...