Gustine, California The Gustine Historical Society is a nonprofit organization dedicated to preserving, researching, and sharing the history of Gustine and the West Side of Merced County, California. Through museum exhibits, archival collections, photographs, documents, educational programs, and community events, the Society connects past generations with the people and stories that shaped the region. Its collections are housed at the Gustine Museum and the Wilbur and Irene Gomes Gustine History Center and are made accessible to the public for research and learning.