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From Hubbard & Ramachandran (2005): [...] the estimated prevalence of synesthesia has varied dramatically, between as many as 1 in 20 (Galton, 1883) and as few as 1 in 25,000 (Cytowic, 1989). The most widely cited study to date suggests that synesthesia occurs in at least 1 in 2000 people (Baron-Cohen et al., 1996), although this is now generally ...

The wikipedia Article on Synesthesia cites some prevalence studies Random population studies ... determined that 1 in 23 individuals have some kind of synesthesia, while 1 in 90 have colored graphemes (Simmer et al 2006). Colored days of the week and colored graphemes are the most common types(Simmer et al 2006; Campen, 1999). References Simner ...