This list is ordered alphabetically by country. Government sites in United States are separated from the rest and listed first. If you have a suggestion for an addition send a note via online chat or by email.
Bureau of Transportation Statistics - You can use RITA (Research and Information Technology Association) to find datasets by browsing the subjects listed in the Data Finder on the left hand side of the screen. Choose a topic and then either do an online analysis or download the file.
Department of Housing and Urban Development