According to the US Department of Justice, Bureau of Justice Statistics, "Capital Punishment, 2008 - Statistical Tables - Number of Persons Executed by Race, Hispanic Origin, and Method, 1977-2008" (accessed Aug. 12, 2010) 
36 states in the US have the death penalty and they each use a different method according to what the state sees as being constitutional.
1. lethal injection
2.Electrocution
3.gas chamber
4.hanging
5.firing squad
Idaho ended executions by firing squad on July 1, 2009. Oklahoma allows the use of firing squads if lethal injections and electrocutions are found unconstitutional. Utah outlawed the practice on May 3, 2004, but allows it for inmates who select the method and were on death row before it was outlawed. On June 18, 2010, Ronnie Lee Gardner was executed by firing squad in Utah.]