- Baskin Robbins has 31 flavors
- I am 31 years old
- January 31 is the 31st day of the year in the Gregorian Calendar
- Proverbs 31: 30-31....
30 Charm is deceptive, and beauty is fleeting;
but a woman who fears the LORD is to be praised.
31 Give her the reward she has earned,
and let her works bring her praise at the city gate.
- My progesterone level is 31 (!)