May 18 2012
The duo, along with Jake Caprice, Nathaniel Pinney and Charlie Holness, will have to look for new clubs after their contracts expire at the end of June.
Hills, who finished the campaign on trial at Southend after an injury-hit two years, made 47 appearances and scored one goal for the Eagles after coming up from the Academy.
He confirmed on Twitter: "Just to let everyone know, I won't be at Crystal Palace any more but had a great time there since I was 14 years old. I love the club and the fans.
"And I wish it every success in the future! Time for a new challenge for me and to play games after the 2 years I've had out. Thanks again to the fans u were tremendous."
Andrew went on loan to Leyton Orient for the closing stages of the season after dropping down the Palace pecking order. He scored four goals in 66 appearances after joining from Luton in July 2008.
A statement on the club website read: "Palace would like to thank the following five players, who will be leaving Palace once their contracts expire at the end of June, for their contribution to the club."
Academy players Vences Bola, Jordan Clark, Ronnel Dennis and Malakai Field have also been released.
Meanwhile, Palace have confirmed they have offered centre half Anthony Gardner a new contract after his one-year deal has come to an end.
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