In April 2006, Massachusetts enacted a health care reform bill that seeks to move the state to (almost) universal coverage through a combination of Medicaid expansions, subsidized private health insurance coverage, and insurance reforms. As part of an evaluation of the impacts of the state's reform effort, we conducted a baseline survey of 3010 adults aged 18 to 64 years old in Massachusetts. The survey was conducted by ICR/International Communications Research between October 16, 2006, and January 7, 2007, using a Computer Assisted Telephone (CATI) interviewing system. This report provides a detailed overview of the Massachusetts population in Fall 2006.