Details on the goddess Benzaiten can be found here. I have been unable to find any estimates for the number of Benzaiten shrines. My own data base, which now includes 64,252 shrines, has just twelve where Benzaiten is in the name of the shrine or where she is indisputably the main enshrined kami. In many other shrines there are subordinate shrines to her and this number must be quite large, I would hazard a guess at least in the high hundreds, and adding in the temples where she is worshipped may well double the shrine figure. The following three are usually considered to be the Top Three Benzaiten Jinja.

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Enoshima Jinja    Kanagawa-ken, Fujisawa-shi, Enoshima 2-3-8

  江島神社 弁才天    神奈川県藤沢市江の島2-3-8

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Itsukushima Jinja  Hiroshima-ken,  Hatsukaichi-shi, Miyajima-chō 1-1

厳島神社   広島県廿日市市宮島町1-の1

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Hōgon-ji, Tsukubusuma Jinja   Shiga-ken, Nagahama-shi, Hayazaki-chō 1664

宝厳寺竹生島神社    滋賀県長浜市早崎町1664