I generated this list in April 2014, so it's out of date by a whole decade now. When I have time, I'll put together a Quarry query to allow it to be periodically updated. In the meantime, if you're working in this area please feel free to edit it (e.g. to remove deleted redirects).

This is a list of all template redirects to templates whose names begin with "WikiProject".

	title begins	instances	% of total
	WP	2118	48.07
	WikiProject	1140	25.87
	Anything else	1148	26.06
Total		4406	100
In the WP list:
	no transclusions	529	12.01
	≤10 transclusions*	663	15.05
	56.28% of this list		27.06
In the WikiProject list:
	no transclusions	409	9.28
	≤10 transclusions*	285	6.47
	60.88% of this list		15.75
In the anything else list:
	no transclusions	510	11.58
	≤10 transclusions*	194	4.40
	61.32% of this list		15.98
% of total redirects unused:			58.78

* Basically, not used.

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Note: once you filter out subpages (/class, /doc, etc.) this section drops to ~880 items, of which perhaps another 5% are variations on capitalization or whitespace. The number of distinct WikiProjects represented here is approximately 850.