Various websites track U.S. dollar bills including Where's George?, TrackDollar.com and TrackDollarBills. An entire subculture revolves around tracking U.S. dollars across the world. This process starts when someone finds a bill marked from any of these three websites. Next, the user inputs a bill's serial number to track the currency. To become a registered tracker, a free account must be created.
Where's George? was established in December 1998. As of August 2014, users on this site can input the dollar bill's serial number and the zip code where the bill is located to track the dollar. Bills registered at Where's George? have a red ink stamp that proclaims "Where's George?" The web address is also displayed on the bill. Users with an account get an email message every time a Where's George? bill is tracked with a zip code.
TrackDollar.com started in 2008 and tracks dollar currency around the world. Users earn "track points" for the number of bills inputted on the website. As of August 2014, TrackDollar.com has more than 668,000 bills registered with more than 20 million miles traveled. TrackDollarBills.com traces all denominations of American currency.
Where's George? has a huge cadre of users, known as Georgers, who track every dollar bill they see. Robert Rothenberg entered nearly 100,000 bills into the website's database. From July 2010 until March 2013, Rothenberg received at list one hit per day on bills that he input into the Where's George database.