The laws in the United States regarding open carry of handguns are vary from state to state. Below is the full list of open carry states:
States permit open carry without requiring the citizen to apply for any permit or license: (11)
Alaska<br>Montana<br>Idaho<br>Wyoming<br>Nevada<br>Arizona<br>New Mexico<br>South Dakota<br>Vermont<br>Kentucky<br>Virginia
States permit open carry with restrictions: (13)
Utah<br>North Dakota<br>Minnesota<br>Iowa<br>Tennessee<br>Mississippi<br>Georgia<br>Indiana<br>Maryland<br>New Jersey<br>Rhode Island<br>Connecticut<br>Massachusetts
States prohibit open carry: (7)
New York<br>Oklahoma<br>South Carolina<br>Arkansas<br>Texas<br>Illinois<br>Florida
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The best site for laws is this
http://www.handgunlaw.us/