Unless a place name is at the end of a sentence and followed by sentence-ending punctuation, whenever you list a city and a state or a city and a country, place commas around the state or the country. The rule applies even when the country or state name is abbreviated.

Does the comma go after the city or state?

A comma must follow the city name that is closest to the state. When two cities' names precede a state's name, the city closest to the state needs a comma after it. Use a comma to separate a city from a state.

Is there a comma between city and state abbreviation?

Punctuation. When punctuating state names, you should place a comma between the city and state, and another comma after the state name, unless the state name is ending the sentence or indicating a dateline. For example, ... (No comma after state abbreviation because it ends the sentence)