The Sentinel Communities project follows the experiences of 29 diverse communities and their efforts to promote health and well-being. Since the onset of the COVID-19 pandemic, researchers have studied the following communities—Finney County, Kansas; Harris County, Texas; Milwaukee; Mobile, Ala.; San Juan County, N.M.; Sanilac County, Mich.; Tacoma, Wash.; Tampa, Fla.; and White Plains, N.Y.—in depth to understand impacts on community members and local mitigation efforts.