Commas to Separate a City and State
Use a comma (,) to separate a city from a state.
Paul lives in Butte, Montana.
1. When a city and state appear together at the beginning or in the middle of a sentence, a comma must follow both the city and the state.
Dallas, Texas, is my home.
2. When the name of the state is the last word in a sentence, it is NOT followed by a comma. It is followed by the sentence's final punctuation.
Do you live in Dayton, Ohio?