Can a married person enter a common law marriage if I live in New York and I know it's not legal here but even if it’s in a different state?

You can enter a common law marriage in another state, however, since New York State does not recognize common law marriage, you will not be considered married under the laws of New York. This also means that until you obtain a legal marriage in another state or New York, then even if the marriage is recognized in another state, you would not be able to file for divorce in New York State.