• Use a comma before and or or in a series.

red, white, and blue
faculty, students, or parents

• When a city-state or city-country combination appears in the body of a sentence, follow the name of the state or country with a comma.

My house is located in Astoria, Oregon, and was built in 1911.
She traveled to Istanbul, Turkey, by plane.

• When listing a date in the month-day-year format in the body of a sentence, follow the year with a comma.

Between December 1, 1999, and January 2, 2000, they attended 32 parties.