Gun laws in the United States-
http://en.wikipedia.org/wiki/Gun_laws_in_the_United_States_(by_state)
Note- Not sure of accuracy of the table shown here.

States where I spent much time- just curious about their handgun laws.
New Mexico- a "shall issue" state for concealed carry, and permits the open carry of loaded firearms. Concealed permit age 21, training course, test every two years.
Texas- No permit required, no registration, no license required. Concealed carry permit required. Open carry prohibited except on one's own property. Open carry of a long gun not specifically prohibited.
Colorado- No permits etc. required, concealed carry permitted with permit, open carry legal except in Denver where signs are posted.
Montana- Open carry OK, concealed carry with permit OK but not permitted where liquor is served, in banks or government buildings.
Hawai'i- pretty restrictive. Concealed permits rarely issued.
Louisiana- Concealed carry with permit, proficiency test, etc. No open carry.
Washington- Open carry OK, concealed with permit, over age 21.