Rule 2. Use a comma after the name of the person you are speaking to in a sentence.
(Place a comma before and after the name when it is inside the sentence.)
Rule 3. Use a comma to separate the name of a town or a city from the name of a state.
(Place a comma after the state, too, unless it comes at the end of a sentence.)
Rule 4. Use commas to separate words or groups of words in a series.
Rule 5. Use commas to separate the parts of a date.
(When a date is given in a sentence, place a comma after the year, too, unless the date comes at the end of a the sentence.)