John Snow, Inc. (JSI) is a public health research and consulting firm dedicated to improving the health of individuals and communities throughout the world. JSI staff directs the nation-wide Uniform Data Systems (UDS) data collection and reporting projects for the BPHC Health Center Program. JSI also prepares the ZCTA-level UDS data for the UDS Mapper. JSI’s approach to mapping UDS data provided the foundation of the UDS Mapper.