Chontella and others on this thread: It is in fact difficult to find info (all in one place) about the licensing opportunities in different states for master's degreed psychologists. I will give you some links.
First let me tell you that I have been a Licensed Psychologist Associate in Oregon for 13 years. I have a masters degree in clinical psychology. Oregon's system is a two tiered system with both supervised and independent Psychologist Associates. The supervision requirements are extensive. 3 years to get the first tier license, and then 3 more years of supervision to get an independent license. At the point of getting an independent license, the Licensed Psychologist Associate is awarded all the privileges of a doctoral degreed Licensed Psychologist. Insurance companies reimburse us at the same rate as Licensed Psychologists which is considerably more than all other masters degreed mental health professionals (i.e. LPC's, LCSW's, etc).
You may contact the Oregon Board of Psychologist Examiners through their website at http://www.oregon.gov/OBPE/Pages/index.aspx.
There is a list of sorts of the various masters degreed psychologist types on a page of the Association of State and Provincial Psychology Boards (ASPPB) which is primarily designed to show what scores are required for the Exam for the Practice of Professional Psychology (EPPP) for the license types by state. http://www.asppb.org/HandbookPublic/Reports/default.aspx?ReportType=EPPPPassingScore
The National Association of Masters in Psychology (NAMP) may be more descriptive, but not exceptionally so. Still, it's worth a look. http://www.enamp.org/PDF/Licensure%20Information%20NAMP.pdf
You may also contact me at criticalinking@gmail.com. I am interested in all things related to masters degreed psychologists.