The Ireland right-back has made 350 appearances for the club since joining in 2009 from Sligo Rovers.
"It's a massive honour to extend my time here," Coleman told evertontv.
"It was about getting my head down and to keep working hard like I've always done, and the club decided to reward me with that. It's something I'm very happy with.
"Hopefully now I can keep going as long as possible, give my experience to the younger lads, help and support them in any way I can, and contribute on the pitch as much as possible."
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