ucomm>identity>Editorial Guidelines>Comma



Use a comma between the two independent clauses of a compound sentence. A comma precedes the conjunctions and, but, or, nor, for, so, and yet if the second half of the sentence contains its own subject, verb, and object.

The museum is at the corner of Stanford Drive and Willow Street, and it contains many interesting examples of Spanish painting.


The mall is on the southern edge of the city and is a popular shopping destination for students.

Use commas in a series of three or more, and place a comma after the next-to-the-last element in the series.

Faculty members represented many disciplines such as architecture, political science, engineering, nursing, and biology.

Use commas after introductory elements, interjections, and direct addresses.

If the research grant is awarded, we will begin at once.
Oh, I have one more question.
John, let me see the letter.

Do not use commas after short, introductory adverbial phrases.

Since 1997 I have accrued 30 credits in English.
In May more than 2,500 students graduated from the University.
In 2045 the comet will pass this way again.

Use a comma between the day and year in dates. Use a comma after the year for dates in sentences.

March 7, 1957

She was born March 7, 1957, to a wealthy family in Peru.

When a city and state or city and country are used in text, use a comma between the two and following the state or country.

The University was founded in Arlington, Texas, in 1895.
The student chose Paris, France, for summer study.

Do not use a comma between month and year or between season and year.

April 1983 but April 21, 1983

fall 1983

Do not use a comma before Jr. and Sr. when part of an individual's formal name.

Michael E. Smith Jr.

Carlos D. Ramirez Sr.

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