The OC Addicts
- Show, cast, character, episode, and spoiler discussion.
- http://www.theocaddicts.co.uk

California_Dreaming
- Discussion of characters, spoilers, and fan fiction. [registration required]
- http://s4.invisionfree.com/California_Dreaming

Yahoo! Groups : The_OC
- Mailing list for show discussion. [Yahoo! registration required]
- http://tv.groups.yahoo.com/group/The_OC/

Fan Forum - The O.C.
- General show discussion.
- http://www.fanforum.com/forumdisplay.php?f=152

2D1@The O.C. Forums
- Discussion of characters and the actors who play them.
- http://theocryan.proboards7.com/index.cgi

eFanGuide: The O.C. Forum
- General show discussion.
- http://efgforum.com/6/ubb.x?a=frm&s=590606&f=75960557

Fox Forum
- Official forum sponsored by the network.
- http://forums.prospero.com/foxoc/

Coffeerooms the OC
- General show discussion.
- http://www.w3pg.com/forums/tv/oc/