commas with dates, addresses, and place-names
Commas that separate the parts of a date, an address, or a place-name.
In a month-day-year date, put a comma between the day and the year: The lease begins on September 15, 2027. If the sentence continues, put another comma after the year: The September 15, 2027, deadline is firm.
A month and year alone take no comma: The lease expires in September 2028. The September 2028 deadline is firm. The day-month-year style, common in U.S. military writing and British English, also takes no comma: The agreement was signed on 15 September 2027.
Put a comma after a weekday that precedes a date: The hearing is on Tuesday, March 9.
Put a comma between a city and the state that follows it: They opened an office in Portland, Oregon. If the sentence continues, put another comma after the state: Their Portland, Oregon, office opens next month.
In an address within a sentence, separate the street address, city, and state with commas: Send the documents to 84 Willow Lane, Dayton, Ohio 45402. The ZIP code follows the state with no comma. If the sentence continues, put a comma after the ZIP code: The office at 84 Willow Lane, Dayton, Ohio 45402, accepts deliveries.
See also comma.
Examples
Use The April 22, 2028, workshop is fully booked. (In a month-day-year date, the year is set off by a comma on each side.)
Use We expect delivery in November 2027. (A month and year alone take no comma.)
Use The application dated 6 June 2028 is incomplete. (A day-month-year date takes no commas.)
Avoid The meeting on February 12, 2027 begins at noon. (In a full date, commas set off the year, so a comma follows 2027.)
Avoid Our Madison, Wisconsin office handles returns. (After a city, commas set off the state, so a comma follows Wisconsin.)
Mailing labels follow postal conventions, not these rules.