I think you made a little mistake in the topic title How many *meeples* can be on one tile in a game.But uuhm I've actually never had more than 3 meeples on one and the same tile (not counting the acrobats).
Guess 8 could join the single tile party if flyers expansion added?
If you play with the plague then any suitably large and shared feature could share a single tile as they flee from the plague. This in theory could mean all the meeple in play could share a single tile.
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