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Should I close unused credit cards before applying for another?
If you're looking for cause-effect, applying for another card won't matter at all if you're not paying any interest, or not looking to get another installment loan for which the rate you get depends on your credit rating. If you are looking to get another installment loan, then having more credit at your disposal might hurt a small amount.  I wouldn't want to cancel your oldest card.  The GEMB card looks like a good candidate if you want to cancel because you're not using it, and it's a relatively new card.