World Factsheet

A question I never properly came to a definite answer to myself, but within known witchdom (The sphere of influence, reach, and knowledge of witches based from Earth), I'd guess... Up to 1 500 Million, not counting non-witch magical races.

But this also includes many witches who don't exceed ranks 1 & 2 where witches capable of Rank 3 are considered strong. Something like:

• 125m rank 2.
• 15.5m hitting rank 3.
• 900k reaching rank 3. [Presumed typo for 4]
• 30k reaching rank 5.
  The remainder would not exceed Rank 1 or even 0. [...] These numbers spread out all across different realms, pocket dimensions, and worlds. And most of that meaning witches who have one magic reaching that rank. As for the factions specifically, Alfheimr would be the most populous with witches, Alfheimr having more witches than Earth, and the Alliance [being something of a world government split between mainly the summer and winter courts]. The ORC would be next in size, but not in witches alone, as they have I believe it was over 80 million residents in their Deco City metropolis alone. Hawthorne and Arcadia are both very populated with their own landmasses.

There are more rank 1 witches than rank 0 witches. In Dysfunction, Penelope mentions that the complication is "not unheard of", implying it is not common but not vanishingly rare. I assumed a similar low-bound prevalence rate to schizophrenia (1 in 300).