It is the massive compilation of Thayer genealogical data which I (Tricia Thayer Muno) have researched and gathered in a project which was commenced over 45 years ago. It consists of data extracted from numerous original sources and my personal correspondence with hundreds of Thayer families over a period years. I have personally extracted and computerized the Thayer vital records for numerous states, as well as soundexes for 1880, 1900, and 1920 for all states in the Union. The present compilation encompasses the genealogical data of over 45,000 Thayers which have been entered into a lineage linked genealogy computer program (Personal Ancestral File). Those individuals for who there is no known connection to the lineage's of the Colonial immigrants Thomas, Richard, and Nathaniel have also been computerized and are kept in an "Unplaced" file until they can take on identity, hopefully, with the help of the descendants themselves. The Thayer Families Association, established in 1991, will sponsor this proposed publication, which will be incorporated as a multi-volume ambition.