Public health officials are finding health disparities among neighborhoods, with childhood obesity rates and tobacco use higher in some neighborhoods. In Colorado, a unique opportunity is informing a better understanding of geography-based public health through The Colorado Health Observation Regional Data Service (CHORDS). CHORDS is a regional partnership between health providers, public health departments, a health information exchange and the University of Colorado to use real-time data from electronic health records to assist public health officials in their study of community health disparities. Researchers query a specific health question, and data is returned from different healthcare systems via a series of connected virtual data warehouses. This unique data service provides a way for public health officials and researchers to track population trends across healthcare providers, and show the outcomes of policies and clinical- and community-based initiatives.