There are 3 books in the Matched series. The newest book is Reached which came out in 2012.

1
Matched

Book cover of Matched
Cassia has always trusted the Society to make the right choices for her: what to read, what to watch, what to believe. So when Xander's face appears on-screen at her Matching ceremony, Cassia knows with complete certainty that he is her ideal mate . . . until she sees Ky…
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2
Crossed

Book cover of Crossed

Rules are different outside the Society.
Chasing down an uncertain future, Cassia makes her way to the Outer Provinces in pursuit of Ky - taken by the Society to his certain death - only to find that he has escaped into the majestic, but treacherous, canyons. On this wild frontier…

3
Reached

Book cover of Reached

The final thrilling part of the New York Times bestselling trilogy, REACHED is the sequel to MATCHED and CROSSED by Ally Condie. After leaving the Society and desperately searching for each other - and the Rising - Cassia and Ky have found what they were looking for, but at the…