The O.C. - Season 4 - Eps 16: The End's Not Near, It's Here
The Cohen family says goodbye in the series finale as the episode jumps six months after the earthquake to show the Cohens, Ryan, Taylor, Summer and the Cooper women trying to piece their lives back together. The Cohens find out that fixing up their old mansion would cost more than rebuilding it but Ryan and Seth see this as an opportunity to give Sandy and an expecting Kirsten a surprise that'll change their lives.
About The O.C.

Title: The O.C.
First Air Date: 2003-08-05
Last Air Date: 2007-02-22
Status: Ended
Rating: 7.8/10 (from 852 votes)
Language: EN
Seasons: 5
Total Episodes: 92
Network: FOX
Genres: Drama
Production Companies: Warner Bros. Television, Wonderland Sound and Vision, Fake Empire Productions
Synopsis
Ryan Atwood, a teen from the wrong side of the tracks, moves in with a wealthy family willing to give him a chance. But Ryan's arrival disturbs the status quo of the affluent, privileged community of Newport Beach, California.
Cast

Peter Gallagher
Sandy Cohen

Kelly Rowan
Kirsten Cohen

Ben McKenzie
Ryan Atwood

Adam Brody
Seth Cohen

Melinda Clarke
Julie Cooper

Rachel Bilson
Summer Roberts

Autumn Reeser
Taylor Townsend

Willa Holland
Kaitlin Cooper