What states prohibit swearing in public?

Very similar to a Supreme Court Justice's definition of pornography ("You know it when you see it"), the use curse Words in public is a subjective matter, i.e.: You know it when you hear it. When they are stated in such a manner as be offensive to the public at large, or consist of 'fighting Words,' or are demeaning to a person or group of persons, or intended to incite disorder, THEN they become unlawful speech. This is usually enforced by the application of 'public decency statutes' such as a charge of Disorderly Conduct."

Almost every state has laws regarding the use of profanity. In most cases it will end up being handled as a Disorderly Conduct charge. Many are a bit specific about the situations, such as use on or around roads.