Camelia Koi Club
Sacramento Area

ZNA NorCal
SF Bay Area

Utah Water Garden Club
Utah

San Francisco Bay Area Koi Club
San Francisco Area

AKCA
National Organization

The Koi Shack
http://koishack.com/forums/

Koi Reflections
http://backyardpuddle.com/forum/index

Koi Vet
http://www.koivet.com/

Fish Pond Info
http://z2.invisionfree.com/Fishpondinfo/index

Malaysian Koi Forum
http://www.koi.com.my/cgi-bin/koiforum/

Koiphen
http://www.koiphen.com/forums/

Koi .Bito Magazine Forum 
http://www.koi-bito.com/forum/

Nishikigoi International
http://members4.boardhost.com/koimag/