When you want to start your travel therapy career ASAP it might help to know which states do not require licensure.  The following is a list of the states and modalities for which licensure is not required. 

Sorry to my Physical Therapists out there...you must be licensed in all states to work :)

Occupational Therapists:
Colorado

Physical Therapy Assistants:
Colorado
Michigan
Utah
Hawaii

Occupational Therapy Assistants:
Colorado
Hawaii
Virginia

Speech-Language Pathology:
Washington, DC
Colorado
Michigan
South Dakota