Abstract: For the first time in Texas, a county-wide survey of historic sites - including buildings, homes, churches, schools, communities, and events - is available to the public through an interactive map hosted on Collin County's government web site. Visitors can locate these sites and explore related pictures, stories, and descriptions created through a county-wide volunteer effort. This project, a joint effort of the Collin County Historical Commission (CCHC), Collin County GIS and IT departments, and a large group of volunteers around the county, provides an innovative tool for historical preservation, research, and education. Preserving the county’s history and offering it as a legacy for future generations has become a critical priority as the county is increasingly transformed through rapid population growth. Years of work have gone into the research, data input, mapping and program design. The CCHC is an un-paid board appointed by the Collin County Commissioners Court. The programming is done by the GIS and IT departments of Collin County. Notably, CCHC coordinates the volunteers who do all the research and writing. A brief description of the project, as well as a demonstration of the interactive map will be given. Particular attention will be paid to: (a) the management and processes involved in a county-wide volunteer project, and (b) the issues involved in the collaborative partnership.