BAFs have been created for each of the 50 states, the District of Columbia, and Puerto Rico. Â Each file contains 2010 Census tabulation block codes and geographic area codes for a specific geographic entity type. Â Each BAF contains every block within the given state, even if the block is not within one of the geographic areas represented in the file. Â For those blocks where no geographic area is present, the block is listed, followed by one or more commas (depending on the file layout for the specific geographic area type).