If you choose “United States” as your option under Geography, all US census tracts, or counties, are ranked against one another. Use “United States” for US-wide or multi-state mapping and analysis.
If you choose an individual state, or “Puerto Rico, or “District of Columbia,” tracts or counties are ranked against other tracts or counties in that state. For years 2000 and 2010, if you choose “All States” with the geodatabase option, you’ll receive an .mdb file that includes all the individual states with tracts or counties ranked against tracts or counties within the respective individual states. For years 2000 and 2010, if you choose the .csv option, you can download individual .csv text files for each state. Use these files for state-wide or within-state mapping and analysis only.