There are at least three Santa Clauses on the planet.
They are all cities in the United States, located in Georgia, Arizona, and Indiana. For many years, the one in Indiana has sold maps with specific spots for Christmas parties. Tourists may encounter Santa Claus, the holiday's major emblem, here. Santa Claus, Georgia, has just a park, a church, and eight streets with seasonal names like Rudolf St. or December St. The third Santa Claus is from Arizona. It is a ghost town with only a few buildings along a road.
Billy has also appeared in films other than Saw. Insidious, Dead Silence, and Death Sentence all featured him as an Easter egg.