We have 3 birthdays listed for July 31.
July 31st is the 212th day in the Gregorian calendar. In 1972, the cornerstone of the U.S. mint was laid in Philadelphia. In 1980, China's population reached one billion. In 1989, Nintendo's Game Boy device was released. J.K. Rowling, Zac Brown and Annie Parisse were born on July 31st. It also marks National Mutt Day and National Avocado Day.