Unveiling the Most Common Birthdays in the United States: An Analysis

An Overview of the Most Common Birthdays in the US

updated 2024, March 06th.

The United States is a diverse country, with people from all walks of life celebrating their birthdays on different days throughout the year. However, certain dates stand out as the most common birthdays in the US. In this article, we will explore which days of the year are the most popular for births in the United States and the factors that contribute to these trends.

The Most Common Birthdays in the US:

Based on data from the Centers for Disease Control and Prevention (CDC) the heatmap above was created displaying, the most common birthday in the US is September 9th, followed closely by September 19th, September 12th, and September 17th. In general, September is the most popular month for births in the US, with 9 out of the top 10 most common birthdays falling in that month.

Understanding the Factors that Contribute to Popular Birthdays

So, why are September birthdays so popular? Some experts believe that the winter months, which are the peak season for flu and other illnesses, lead to a decrease in conceptions during that time. As a result, there is a natural increase in the number of births in the late summer and early fall months, nine months after the winter lull.

The Importance of the Fall Season for Popular Birthdays

Other factors that contribute to the popularity of September birthdays include the beginning of the school year, the holiday season, and the change in weather as summer transitions to fall. Parents may choose to time their pregnancies so that their children will be born in September to take advantage of these factors.

Additionally, some studies have shown that parents with higher levels of education tend to have children who are born in the fall, which may be due to the fact that they plan their pregnancies more carefully or have more control over when they conceive.

Other Popular Birthdays:

While September may be the most popular month for births in the US, there are still many other dates that are quite common. The most popular birthday in December is the 18th, which is followed closely by the 22nd and the 19th.

In January, the most common birthdays are the 1st, the 2nd, and the 19th. February birthdays are the least common, with the 29th being the rarest of all birthdays due to the fact that it only occurs during leap years.

March and April have a relatively even distribution of birthdays, with no single date standing out as the most common. However, May and June birthdays are more common, with the most popular dates being May 5th, May 10th, June 1st, and June 11th.

 Whether it is due to the changing seasons, the holiday season, or other factors, the popularity of certain birthdays can offer a fascinating glimpse into the trends and patterns that shape our lives. 

In England and Wales the situation is similar:

...And the workd. The most common birthday in the world is Septhember the 9th