I don't know of any active posters from Alabama, Arizona, Delaware, Hawaii, North Dakota, West Virginia, and Wyoming. I have seen all of these in use at least once however, either by inactive posters or posters who switch around their avatars.
Party avatars I have never seen through any means:
D-DE
D-NM
D-WV
R-HI
R-KY
R-ND
R-WY
R-WY was used by Svensson, who was around during the 2010 cycle (although if I remember correctly he got banned for something and become a sockmaster later; don't know if he counts).