This data was created as part of a study that examined the accessibility to jobs by transit in the 50 largest (by population) metropolitan areas in the United States. It is the most detailed evaluation to date of access to jobs by transit, and it allows for a direct comparison of the transit accessibility performance of America's largest metropolitan areas. This data is part of a longitudinal study. Downloads are available for individual metropolitan regions, as well as states, open-source Geopackage format. Combined ZIP files containing the data for all 50 metropolitan regions are also available in Geopackage format, and are labeled as "All Metropolitan Regions."