Thirty One is the second studio album by American actress and country music singer Jana Kramer. It was released on October 9, 2015. It became available for preorder on August 27, 2015 on iTunes, the same day the track list was revealed.

On the album's title, Kramer explained, "I want this title to be strong; I want this title to be me. I want this title to somehow portray the woman that I am. There's no other way of saying that than 'Thirty One.'"

Giving it a "B", Bob Paxman of Nash Country Weekly thought that "The songs here are mostly good, but it's hard to discern a real identity from the album as a whole." He thought that the first two singles, plus "Boomerang" and "Said No One Ever", were the strongest cuts.

The album debuted at No. 3 on Top Country Albums, and No. 10 on the Billboard 200, with 18,000 copies sold in the US in the first week. It sold a further 5,000 copies in its second week. The album has sold 79,000 copies in the US as of October 2016.

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