How many Number Monsters have been released in Yu-Gi-Oh thus far?
125 Number Monsters

The Yu-Gi-Oh! Wikia has a semantic search function that allows for creating complex queries. In this case, we want to query things that are:


Monsters in the real-life card game (either OCG or TCG)
Part of the "Number" archetype (including variants, like C and S)


This query can be constructed with [[Concept:CG monsters]] [[Archseries::Number]]. Running the query shows that there are 125 Number Monster cards at the time of this writing.

If we add [[Category:TCG cards]] to the query, we find that there are 122 Number Monsters in the TCG. The 3 that exist in the OCG but not the TCG are:


Number 29: Mannequin Cat
Number 41: Baguska
Number F0: Utopic Future - Future Slash