What information is on a minimum wages poster and what businesses have to post it?

All businesses are required to post certain posters. The minimum wages poster merely makes an announcement of the current minimum wage in the U.S. It may also contain other information, depending on the specific poster. This site has .pdf files of various posters. The first column lists the posters. The links in blue take you the .pdf file for printing: http://www.dol.gov/osbp/sbrefa/poster/matrix.htm