Answer:
This is my list of states where it is illegal to play at online casinos. I am not sure if this covers online poker.
ILLINOIS (IL)
INDIANA (IN)
LOUISIANA (LA)
MICHIGAN (MI)
NEVADA (NV)
NEW JERSEY (NJ)
NEW YORK (NY)
OREGON (OR)
SOUTH DAKOTA (SD)
WASHINGTON (WA)
WISCONSIN (WI)