The Most Common and Least Common Birthdays and Zodiac Signs


What Definitive Sources Say

On the average, 11,000 babies are born in the U.S. every day. When a Harvard University study counted the number of people born on each day of the year between 1973 and 1999, results showed that the most common birthday for U.S. residents was September 16, followed by September 9, 23, 17, 22, and 21. Newer averages from the U.S. Social Security Administration show that between 2000 and 2014 the day with the largest number of births has become September 9, followed by September 19, 12, 17, and 10, and then July 7. The rest of the top 10 most common birthdays are in September, the most common birthday month.

The least common birthday month is January. The Social Security averages show that for the entire span of January 1 through May 22, the most popular birth date is February 14: Valentine's Day.

The Rarest Birthdays

Studies of the most common individual U.S. birth dates show they always cluster from midsummer to early autumn, with minor variations. One study by the now-defunct data site found the most common birthday to be October 5, and the least common, May 22. The Harvard study gave December 25, Christmas, as the least common birthday, and January 1 and December 24 as the next least common. This reflected a trend during the study years, 1973-1999, to induce or delay childbirth for reasons of convenience.

Newer information from 2000-2014 shows that this pattern--many fewer births on holidays--is unchanged, with the top 10 least common U.S. birthdays all on major holidays or adjacent to them. December 25 is still the rarest birthday, with only about 6500 babies born that day. The next least common birthdays are January 1, December 24, July 4, January 2, December 26, November 27, November 23, November 25, and October 31.

The rarest U.S. birthdays outside of holidays are April 1 and April 13. An infographic analysis of the Social Security data shows that when U.S. parents can schedule a birth, they avoid the 13th of any month.

Birthdays and the Seasons

A study of births in Massachusetts covering 2005 to 2014 said the most common birthday in that state was, surprisingly, June 27, and the second-most-common September 19, then August 1, then July 7. Its much larger source study, originating at Princeton University, compiled 78 years of birth data including all 50 states and 118 mostly Northern Hemisphere countries. Midsummer to autumn was baby season everywhere, but results showed that the farther north the birthplace, the earlier in the summer the birthday; thus June 27 in Massachusetts, and more births in October in equatorial countries.

In England and Wales the least common birthdays are December 25, December 26 (Boxing Day), and January 1, and the most common, September 26. The prevalence of late summer-early autumn births is natural, according to some sources--tied into the harvest season, when food is especially plentiful.

But in New Zealand, government birth data gathered from 1980 to 2015 shows December 25 is also the least common birthday, and the most common is September 30. Christmas in New Zealand is in the summertime, so December doesn't have to be cold to inspire more baby-making.

Most Common Birth Times and Zodiac Signs

No study has confirmed the most common zodiac signs. This is because births during "cusp" periods -- from the 19th to 23rd of any month -- require precise birth times to pinpoint the placement of the Sun as it leaves one zodiac sign and travels into the next. In 2013, the widespread use of a new birth certificate form allowed the U.S. Center for Disease Control and Prevention to study birth times in 41 states and determine that most babies born in a U.S. hospital (97 percent of births) are born around 8:00 a.m. and 12 noon, and births outside of hospitals occurred mostly between midnight and 3:00 a.m. Before 2003, individual states had their own birth-certificate forms. Only some of them recorded babies' birth times. Especially for people over age 60, proof of an individual's time of birth is often hard to obtain.

But from available evidence about the most common birth months and birthdays we can discern that the most common zodiac Sun signs are Virgo, governing those born around August 20 until September 21, and Libra, for those born in the last week of September and first three weeks of October.

If you have plenty of Leo, Cancer, and Scorpio friends, that is natural, because they were probably born in one of the four most popular birth months. Those born in the first three weeks of July are Cancers; late July and early August children are Leos. Those born in the first weeks of October are Librans, and those born in the last ten days of October are Scorpios.

Working backward from this information we see that late-summer early-fall birthday people were conceived in late fall to mid-winter, with conceptions peaking around Christmas and New Year's Day. An online claim that Scorpio (October-November) is the most common zodiac sign, followed by Virgo and then Gemini, gives no source for that information. But as Valentine's Day, February 14, has been inflated into a major holiday, there are more November births, peaking on the days November 1, 7, 19, 20 and 21. So the millennial generation might indeed include a larger percentage of Scorpios.

The month with the fewest birthdays is February because it's the shortest month, but the full-length month with the fewest birthdays is January. Several astrological sources say that Aquarius (late January to February 21) is the least common zodiac sign. No sources agree on the second-least-common zodiac sign, although some suggest it is Gemini. If we were to count only the youngest Americans, the second-least-likely zodiac sign would be Capricorn.

Which Sign is Most Common?

Which Sign Do You Think is Most Common?

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© 2011 SylviaSky

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Comments 30 comments

Jean Bakula profile image

Jean Bakula 5 years ago from New Jersey

Hi Sylvia,

I have gone nuts trying to get birth certificates for people in my parent's generation. It used to be easier before 9/11, at least in NJ. All I had to do was write to the Clerk of Whatever Township the hospital was in. It's so frustrating. I have good guesses about some of their ascendants, but verification would be nice. My Mom was born on July 4th, and so was I. She says her Dad always spoke of the fireworks going off. But when I got her Cert, she was born around dawn that morn, an odd time for fireworks. Interesting B-day info though, I thought people were probably mostly born earlier in the summer! Nice hub!

SylviaSky profile image

SylviaSky 5 years ago from USA Author

Thank you for the compliment! Birth times are hard to get. If only people knew how astrologers need those! People aren't looking at the clock while a baby is being born. Mothers' memories aren't always reliable. There is daylight savings time which can differ from state to state and, for WWII-era births, War Time to contend with and correct for. And I am not convinced that astrological "rectification" of birth times gives accurate results.

Jen 5 years ago

Wow September 16th is the most common birthday. That's my birthday

Jean Bakula 5 years ago

Hi Sylvia,

I've come back to this hub again! My son has attended a martial arts school for 13 years. I can't tell the percentage, but out of the main 25 higher ranks, at least 12 of them are Scorpios! He is included, having a Scorpio sun and moon. Thankfully he has Virgo rising, and a stellium in Sag, so he's downright sunny for a double Scorp! Take care, Jean

Gem Scooper profile image

Gem Scooper 5 years ago

Hi Sylvia--Never have I paid attention to who has the most common birthdays all throughout the year, but when I read your article, then- oh! It must be the season why births happen around September...and to think that the least date of birthday celebrants is May 22nd is somewhat an irony on my end...I am a Gemini, and my fellow Geminians in my work-group were born on 5/22nd...and they know each other- though they were born 16 years apart, and from 2 continents. Very informative!

Barn Lars 4 years ago

I've been looking through a few articles on 'least common' and 'most common' astrological signs...and not ONE mentions Pisces.

'Most ignored astrological sign'? Sniffle. End of February, for me.

SylviaSky profile image

SylviaSky 4 years ago from USA Author

I agree Pisces gets the short end of the stick, the most neglected and poorly understood of all Sun signs. Probably because it is the most complex.

Estellsa 4 years ago

Wow, my birthday is on May 22nd, and I know someone who was born on the same day in the same hospital! I had no idea it was one of the least common birthdays, I would have never guessed!

j9dscfisjhdidro 4 years ago

Who CARES what your sun or star sign is?

Astrologist 4 years ago

i Think feb 7 least common brithday date.......

INFECT the mother, PULL the switch 4 years ago

I though saggitarius was the least common sign.

For birthday.. I'd have to agree around feb.

then again i bet all the signs and birthdays are evene'd out.

most common sign to me, is Capricorn.

Ugo 4 years ago


Debbie Andrews 4 years ago

I agree that Feb 7th (& all Aquarian birthdays) are the least common..I have never met anyone born on my birthday (7th Feb). Alas, if only there WERE more Aquarians in the world - it might be a better place because we care so much for the good of humanity.. :D

That sounds a bit big-headed but not meant to be..

SylviaSky profile image

SylviaSky 4 years ago from USA Author

That is interesting; I have never met another January 23 either!

Sammie 4 years ago


Mine Is January 22nd.So close DL

Ferlyn 4 years ago


I've never met another January 23 in my life.

And hey, you're the 1st one!! ='3

May i ask wads your ascendant sign?

SylviaSky profile image

SylviaSky 4 years ago from USA Author

My ascendant is Scorpio. My moon is Scorpio also.

Baby Ferlyn profile image

Baby Ferlyn 4 years ago from Singapore

My ascendant is in Scorpio too. My moon is in Libra. =]

Sylvia, do you know where can i read/learn about:

"How does our Sun/Moon/Rising combination affect us?"


Tatiana 4 years ago

My question has always been "WHY are there more/less birthdays at one time of a year than another?" My mom is an obstetrician so I definitely notice when some months are busier for her in the delivery room than others! All I can think of for the September business (ironically, my dad's birthday is in August and my mom's is in September) is that couples may be 'busy' around the Christmas/New Year holidays. Wonder why February is infrequent though!

magnorth 4 years ago

i know lots of people born in february and 2 people born on 22 may. although almost everyone in my life is a scorpio or libra. i know of 5 people with my birthday july 5 and 13 people around my birthday!

rose 4 years ago

lololololol Ibet there are a lot of autumn birthdays because of christmas , new years, and Valentine's Day sex ;) so if you were born in november then that means your parents had a nice valentines day

EuroNinila profile image

EuroNinila 4 years ago from NYC BABY

Funny pretty much all of my family is Aquarius, while me and my cousin are both considered outsiders because we are Libras. Interesting hub to read!

lovedoctor926 4 years ago

Sept 26- so that makes me libra. Voted up interesting hub.

Guest 4 years ago

For me, the most common to least common ranking for the signs goes like this (1 being most common, 12 least common):

1. Cancer

2. Gemini

3. Leo

4. Aquarius

5. Aries

6. Scorpio

7. Capricorn

8. Virgo

9. Taurus

10. Libra

11. Pisces

12. Sagittarius

(Taurus and Libra IMO are pretty tied though -- I don't see very many of either.)

Also, the least common birthday is definitely February 29th... Don't even need to question it.

Plouymarks 3 years ago

I know 6 people born on March 8th and in the month of March as a whole. That's so weird! Also Libra's astrological sign doesn't start until the 23rd of September to October 22nd.

SylviaSky profile image

SylviaSky 3 years ago from USA Author

The Sun enters each sign at a slightly different time each year. These are the dates the Sun entered (or will enter) Libra:

2009: Sept. 22

2010: Sept. 24

2011: Sept. 23

2012: Sept. 22

2013: Sept. 22

Jonathan Shearman 3 years ago

The most common zodiac signs are Libra and Scorpio, most people acoount for sag, cap, aqu, and pisceans. Libra is the most common zodiac sign found among social crowds and bystander people, you can walk up to most strangers and ask them their birthdate, and you will get from 4 of 5 people who say scorpio or a malevolent left sided sign, a Libran birthday, to get an Aries would have to be a little more intelligently or ingenuatively pinpointed, they are a more randomized social zodiac sign among births.

The rarest zodiac signs confirmed are Gemini and Leo.

Leos are found very scarcely among databases of people revolving around subjects or personell, and they all sway in secondary thinking, antiheroism, arrogance, popularity, or personal safety are some examples, studies by astrology analysts, scientists, have shown Gemini to be the other rare sign, they are usually scarce among extremely popular celebrities of mainstream entertainment and music arts.

Jo Jo Davidson 15 months ago

I was born September 16, 1949 at 11:43 Am. How can I get an accurate reading? Where do I go to find it? Thank you Jo Jo Davidson

SylviaSky profile image

SylviaSky 15 months ago from USA Author

Hi, Jo, and happy birthday! For free you can input your birth information at the website and you will receive a printable chart and a very basic but genuine reading of the features of your birth chart. If you want to learn more about the present or future, consult a professional astrologer.

Jinie 3 weeks ago

My sister's birthday is on December 25th, the least common birthday!

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    Sylvia Sky, M.A., astrologer and Tarot professional, author of Sun Sign Confidential: The Dark Side of All 12 Zodiac Signs

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