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What Is the Most Common Birthday Month and Year in the U.S.?

Have you ever noticed that there are months where there are birthdays within your circle practically every day? Here at Kremp Florist, we’re passionate about birthdays, so we’re happy to present to you an analysis of the 29,882,341 recorded births (between 2016 and 2023) in the CDC WONDER Natality database to determine the most common birthday month. Any guesses? We’ll unwrap that in a bit! As frosting for this data-delicious birthday cake, we dipped into nearly 16 million U.S. Census American Community Survey responses to find the most common birth year in every state as well. To add sprinkles on top, we also found the average and median age by state using this abundance of data. Which states would you guess are the oldest and youngest? Without further ado, let’s get this party started!

What Is the Most Common Birthday Month?

The most common birthday month by far is August, reigning supreme in 45 out of 50 states. Why is August the most common birth month most common birth month? If you count back nine months from August, you would be in the late fall and early winter, making November and December the most popular times to conceive. There are a few factors at play here:

Season’s Greetings

Chilly temperatures outside mean more time and desire for closeness indoors. The festive period between Thanksgiving and New Year’s Day is packed with quality time, relaxation, celebration, and just all-around joyful spirits; these happy feelings are often the perfect ingredients for more merry intimacy.

Fertility Boosts

There may also be science at play; some research suggests that sperm quality may be higher in winter and lower in summer because sperm prefer cooler environments (extreme heat reduces sperm quality, quantity, and mobility). The time of year also affects female fertility. Shorter fall and winter days boost melatonin levels, which help you sleep within your natural circadian rhythm, and this may indirectly support the stability of fertility hormones like prolactin and luteinizing hormone.

Practicality and Human Nature

Of course, every pregnancy is different, and it’s impossible to predict exactly how it will unfold. But for many people, the ideal time to have a baby is during the summer (which also happens to be the most unpleasant time to be pregnant). There are no major holidays to plan around, there’s less risk of seasonal illnesses, and you might even have more time off already built into your annual schedule. The desire to conceive in winter and give birth in summer might also be evolutionary; in many climates, a newborn has a better chance of survival if it avoids challenging winter conditions during infancy. July is a close second for the most common birth month, further supporting the theory that these factors influence the most common birthday month.

What Is the Most Common Birthday in the United States?

The most common birthday in America is actually Sept. 9: Surprisingly, it’s not in August. According to birth data from the National Center of Health Statistics and the Social Security Administration, an average of 12,301 births have happened on Sept. 9 each year over the past 20 years. If you’re a Sept. 9 baby, you share a birthday with Adam Sandler, Hugh Grant, Otis Redding, Michael Bublé, Leo Tolstoy, and KFC’s founder, Colonel Harland Sanders himself! That’s a whole lot of talent (and flavor).

Which U.S. State Has the Oldest Population?

The oldest U.S. state, according to our research, is Maine; the median age of Maine residents is 55. Why does Maine have an older population? According to Maine.gov, the golden age of the state “reflects broader national and global shifts, where populations are living longer and birth rates are declining.”

Which U.S. State Has the Youngest Population?

Which U.S. state has the youngest population, according to our findings? The youngest U.S. state is Utah, with a median age of 37. Why are there so many young people in Utah? A major contributing factor is that Utah has the highest birth rate in the nation. The University of Utah Kem C. Gardner Policy Institute describes Utah’s unique demographic profile as “youthful, aging, urban, and more racially and ethnically diverse.” However, much like the rest of the country, average ages are increasing across the board.

Kremp Loves Birthdays!

We hope you enjoyed learning about the most common birthdays and birthday months in America. No matter how common a birthday is, we believe in treating each one like a special occasion. We offer a delightful selection of birthday flowers perfect for celebrating someone you care about. Of course, flowers aren’t the only way to bring an uplifting aroma to their special day; birthday flower candles are sure to please! Know someone who is quite proud of their birthday month? You might also send them one of our precious birthstone bears or a pair of charming birthstone earrings.

What Are the Most Common Birth Months and Years in the United States?

We’ve identified the most common birth months and birth years among living individuals in each U.S. state by analyzing 15,912,392 U.S. Census American Community Survey (ACS) responses and 29,882,341 birth records from the Centers for Disease Control (CDC) WONDER Natality database. Here are the results:

What Is the Most Common Birth Month and Year in Every State?

State Most common birth month by state Most common birth year by state Most common age by state (estimated) Percentage of people with most common birth year
Alabama August 1958 67 1.62%
Alaska August 2010 15 1.59%
Arizona August 1959 66 1.49%
Arkansas August 1959 66 1.55%
California August 1990 35 1.41%
Colorado August 1990 35 1.47%
Connecticut August 1961 64 1.61%
Delaware August 1957 68 1.93%
Florida August 1960 65 1.62%
Georgia August 1964 61 1.50%
Hawaii August 1953 72 1.53%
Idaho August 2005 20 1.52%
Illinois August 1958 67 1.53%
Indiana August 1959 66 1.53%
Iowa August 1960 65 1.60%
Kansas August 1958 67 1.56%
Kentucky August 1958 67 1.54%
Louisiana August 1956 69 1.61%
Maine July 1955 70 1.92%
Maryland August 1960 65 1.55%
Massachusetts August 2002 23 1.63%
Michigan August 1958 67 1.75%
Minnesota August 1960 65 1.68%
Mississippi August 1960 65 1.62%
Missouri August 1960 65 1.58%
Montana July 1954 71 1.80%
Nebraska August 1960 65 1.56%
Nevada August 1959 66 1.51%
New Hampshire July 1959 66 1.93%
New Jersey August 1963 62 1.59%
New Mexico August 1954 71 1.66%
New York August 1960 65 1.54%
North Carolina August 1960 65 1.52%
North Dakota August 1960 65 1.64%
Ohio August 1958 67 1.60%
Oklahoma August 1961 64 1.45%
Oregon August 1953 72 1.56%
Pennsylvania August 1957 68 1.67%
Rhode Island August 2002 23 1.88%
South Carolina August 1957 68 1.61%
South Dakota July 1956 69 1.59%
Tennessee August 1957 68 1.54%
Texas August 1961 64 1.40%
Utah August 2004 21 1.75%
Vermont August 1954 71 1.85%
Virginia August 1960 65 1.50%
Washington August 1957 68 1.43%
West Virginia August 1956 69 1.72%
Wisconsin August 1960 65 1.75%
Wyoming May 1957 68 1.71%

What Is the Average and Median Birth Year in Every State?

State Average birth year by state (rounded to the nearest year) Average age by state (estimated) Median birth year by state Median age by state (estimated)
Alabama 1978 48 1976 49
Alaska 1983 42 1984 41
Arizona 1978 47 1978 47
Arkansas 1978 47 1977 48
California 1980 45 1980 45
Colorado 1980 45 1980 45
Connecticut 1977 48 1976 49
Delaware 1975 50 1972 53
Florida 1975 50 1972 53
Georgia 1979 46 1979 46
Hawaii 1977 48 1977 48
Idaho 1980 45 1981 44
Illinois 1979 46 1978 47
Indiana 1979 46 1979 46
Iowa 1978 47 1978 47
Kansas 1979 46 1979 46
Kentucky 1979 46 1978 47
Louisiana 1978 47 1977 48
Maine 1974 51 1970 55
Maryland 1979 46 1978 47
Massachusetts 1978 47 1978 47
Michigan 1977 48 1975 50
Minnesota 1978 47 1977 48
Mississippi 1978 47 1977 48
Missouri 1978 47 1978 47
Montana 1977 48 1975 50
Nebraska 1979 46 1979 46
Nevada 1979 47 1978 47
New Hampshire 1976 49 1973 52
New Jersey 1978 47 1977 48
New Mexico 1977 48 1976 49
New York 1978 47 1978 47
North Carolina 1978 47 1977 48
North Dakota 1979 46 1979 46
Ohio 1978 47 1977 48
Oklahoma 1980 45 1981 44
Oregon 1978 48 1977 48
Pennsylvania 1977 48 1975 50
Rhode Island 1977 48 1976 49
South Carolina 1977 48 1976 49
South Dakota 1979 46 1979 46
Tennessee 1978 47 1978 47
Texas 1981 45 1981 44
Utah 1985 40 1988 37
Vermont 1975 50 1972 53
Virginia 1979 46 1979 46
Washington 1979 46 1980 45
West Virginia 1976 49 1974 51
Wisconsin 1977 48 1975 50
Wyoming 1979 46 1979 46

Methodology:

To determine the most common birth year in every state, we analyzed 15,912,392 individual U.S. Census American Community Survey (ACS) responses that were collected between 2019 and 2023. The U.S. Census ACS data was sourced from IPUMS.org and was analyzed using Google Colab and Python. To determine the most common birth months, we analyzed data from the CDC WONDER Natality database that was collected for all 29,882,341 recorded births that took place in the United States from 2016 to 2023.

Notes:

  • The most common birth months and years are approximations based on the largest and most authoritative public datasets available.
  • Birth data on specific days of the month is not made available to the public for privacy reasons.

Sources:

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