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Can signing up at optoutprescreen.com improve my credit score?
If you are the type of person that gets drawn in to "suspect" offers, then it is conceivable that if you are not signing the services offered your credit would be improved as your long term credit strengthens and the number of new lines of credit are reduced. But if you just throw it all away anyway then it is unlikely to help improve your score.  But there is no direct impact on your credit score.