The United States does not have a federal election agency, and thus has no official national voter list. In 2002, the United States Congress passed the Help America Vote Act (HAVA). HAVA required that each state compile an official state voter database by January 2006. Most states complied with HAVA by gathering the voter files available from each individual county. States decided what information to include, what restrictions to place on the use of their voter database, and how much the database would cost. In the United States, several companies have merged state voter information with commercially obtained data to create comprehensive voter databases that include a plethora of personal details on each voter. These companies often provide United States Voter Files to statutorily permitted or otherwise non-restricted users.