1900 was the final year of the 19th century.
- Date Unknown: Hill Valley Stationers was established.
- Date Unknown: Doc mentioned being in a little town that he described was nestled in a broad basin, surrounded by beautiful snow capped mountains and a breathtaking blue sky during a trip to this time.
- Monday, December 31: Final day of the 19th century.
- The Earth Day Special (Mentioned only)(Non-canonical appearance)
- Back to the Future: The Game
- Back to the Future: The Game - Episode 2: Get Tannen! (Shown on sign of Hill Valley Stationers.)