Big ticket Stephen King books. Richard Bachman, non-fiction, and no longer published books are marked as bonus.

*2/2025 Update: I have included notes on connected books and labeled everything in the Dark Tower Extended Universe with "DTEU" and it's number chronologically (I sourced this from user aks0307 's  

Dark Tower Extended Reading Order challenge. I highly recommend checking it out if you have an interest in reading through the universe)*