From the UFC's site, FWIW:
HW: Stefan Struve, 7'0"
Mark Hunt, 5'10"
LHW: Cyrille Diabate, 6'6"
Eddie Mendez, 5'10"
MW: Jason MacDonald, Chris Camozzi, Francis Carmont, Magnus Cedenblad, Tim Credeur, Jared Hamman 6'3"
Rousimar Palhares, 5'8"
WW: Hyun Gyu Lim, 6'3"
+Matt Serra 5'6", but he's not really active.
Mike Pierce 5'8"
LW: James Vick, 6'3"
+Sean Sherk, 5'6", not sure if he's active. Wiki says he's planning to return in 2013.
Thiago Tavares, Clay Guida, Henry Martinez, Spencer Fisher, 5'7"
FW: Pablo Garza, George Roop, 6'1"
Marcus Brimage, 5'4"
BW: Johnny Bedford, 5'10"
Scott Jorgensen, Norifumi Yamamoto, 5'4"
FlW:Jared Papazian, 5'8"
John Lineker, 5'2"
WBW *Ronda Rousey 5'7"
Liz Carmouche 5'6"
This one is pretty pointless to list though, they're the only two on the list.
*Current Champ
+Former Champ