Every state, plus Washington, D.C., has laws that allow some sort of concealed carry of firearms in public, with a variety of limitations. Some states don't even require an extra license for that privilege. Only five states and Washington, D.C. prohibit open carry of firearms.
Federal law prohibits concealed carry in certain locations, such as federal courthouses and prisons. But further restrictions are up to the states.
Here's a look at some of the places where Americans may be able to bring their guns.
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Places of worship
Only 12 states ban concealed carry in places of worship: Kansas, Louisiana, Michigan, Mississippi, Missouri, Nebraska, North Dakota, South Carolina, Texas, Utah, Virginia and Wyoming.
All other states allow clergy or church leaders to decide whether to allow guns.
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Six states do not allow guns where gambling occurs. But some states, including Nevada, do. Casinos there, however, can prohibit guns and arrest people for trespassing if they do not comply with the rule.
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Polling places in many states
Only 10 states have laws banning guns at polling places. In all other states, you can bring a gun to vote and even carry it openly, depending on state law.
However, federal law bans guns in K-12 schools, where many polling places are located.
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Congress approved a law in 2010 that allows loaded, concealed guns in national parks across the country. In states that allow open carry, people can openly carry legal handguns, rifles, shotguns and other firearms into those parks. They may carry concealed guns if allowed by state law.
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Guns are allowed in theaters in every state as long as relevant carry laws are observed. However, at least two large chains — AMC and Regal — prohibit firearms on their premises and may legally ask gun carriers to leave the premises.
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Guns are allowed by law at stores and malls, though any privately owned facility can prohibit them.
In 2014, Target asked people not to carry guns in their stores, but specified that it wasn't a policy change, just a request. A number of other large retailers, supermarkets, and fast food chains have similar policies.
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College campuses in certain states
Ten states, including Texas and Colorado, allow guns on college campuses. Twenty states and Washington, D.C., ban them. In the rest of the states, it's up to the schools to decide.
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Concealed guns are legally allowed in hotels, but many hotels have policies prohibiting them.
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Bars and restaurants in most states
Only 16 states prohibit guns in bars and places that serve alcohol. In other states, including California and Pennsylvania, guns are allowed as long as they're in compliance with concealed and open carry laws.
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Some sporting events
Only six states, including Kansas and Oklahoma, prohibit guns at public sporting events. However, many specific stadiums prohibit guns.
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Hospitals and medical facilities in most states
Only five states prohibit guns in hospitals and medical facilities. Four additional states prohibit guns specifically in mental health facilities, which includes many hospitals that also provide such care.
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Libraries in most states
Some states allow public libraries to prohibit guns. But gun laws in at least 30 states do not allow public libraries to enact policies surrounding gun carry.
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Airports in most states
Many states allow guns in baggage claim and arrival and departure areas of airports as long as the person is adhering to state carry laws. But guns are not allowed on planes.
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Workplaces, under some circumstances
In many states, concealed carry laws do not explicitly ban people from bringing guns to a workplace (unless they work at a place where guns are banned).
Some states allow companies to ban workers from bringing guns, but in other states, including Alabama and Florida, employers can't stop people from keeping guns locked in their cars on the company's property.