Ranked: The Most and Least Common Birthdays in America

How Common Is Your Birthday in America?

Have you ever wondered how many people share your birthday?

Some birthdays are far more common than others, with seasonal trends and major holidays helping shape the calendar. The differences can be striking, even between dates just a few days apart.

This visualization ranks all 366 calendar dates by total U.S. births, from 1 (most common) to 366 (least common). It draws on 142.6 million births recorded between 1989 and 2024 by the National Center for Health Statistics (NCHS), compiled by RareBirthday.

Want to know where your birthday ranks? Scroll to the bottom of the article for a searchable, sortable table of all 366 dates.

The 25 Most Common Birthdays in America

September dominates the top of the ranking, claiming eight of the first 10 spots. September 9 takes first place, followed by September 20, September 19, and September 14. July 7 breaks the pattern in fifth place, while December 28 ranks sixth despite falling during the year-end holiday period.

The table below shows the 25 most common birthdays.

Rank	Birthday
1	September 9
2	September 20
3	September 19
4	September 14
5	July 7
6	December 28
7	September 12
8	September 10
9	September 18
10	September 21
11	September 15
12	September 17
13	September 16
14	September 8
15	December 20
16	August 16
17	September 22
18	August 8
19	September 27
20	September 13
21	September 23
22	September 25
23	August 30
24	December 29
25	September 26

Why September Dominates the Birthday Calendar

September’s birthday boom is often attributed to conceptions during the winter holidays. But research suggests the explanation goes beyond when people choose to start a family.

A 2020 study following more than 14,000 women in North America and Denmark found that participants were most likely to begin trying for a pregnancy in September. However, after accounting for that timing, their chances of conceiving in a given menstrual cycle peaked in late fall and early winter. The seasonal difference was strongest in the southern United States.

That distinction matters: when people start trying and when they conceive do not necessarily follow the same pattern. The findings suggest September’s popularity reflects a combination of pregnancy planning and seasonal variation in conception, rather than holiday timing alone.

How Holidays Change When Babies Are Born

Excluding February 29, Christmas Day is the rarest birthday, followed by New Year’s Day and Christmas Eve. Independence Day is the fourth rarest among dates that occur every year, while November 24–27 also appear among the 25 least common birthdays overall.

Rank	Birthday
366	February 29
365	December 25
364	January 1
363	December 24
362	July 4
361	January 2
360	December 26
359	November 26
358	November 25
357	November 24
356	November 27
355	October 31
354	November 28
353	November 23
352	April 1
351	December 23
350	December 31
349	July 5
348	January 13
347	May 27
346	January 15
345	March 13
344	January 16
343	April 13
342	February 13

Holiday dips can reflect births shifting to nearby dates. A study using California birth records found approximately 18% fewer births on holidays and the following day. Researchers traced the displaced births to a window stretching from 11 days before the holiday to 16 days afterward.

This offers a possible explanation for December’s contrast. Delivery scheduling can contribute to both a holiday lull and higher birth counts on surrounding dates, although the ranking cannot establish how much it explains December 28’s unusually high position.

Thanksgiving also differs from Christmas in an important way: its date moves each year. Any Thanksgiving-related dip is therefore spread across several late-November dates in a multiyear ranking, rather than concentrated on one fixed date.

Find Your Birthday: All 366 Dates Ranked

The complete ranking includes all 366 calendar dates, including February 29, which ranks last largely because it occurs only once every four years. The rankings are based on total births between 1989 and 2024, without adjusting for how often each date occurred.

Use the searchable, sortable table below to find your birthday and see how it compares with the rest of the calendar.

Rank	Birthday
1	September 9
2	September 20
3	September 19
4	September 14
5	July 7
6	December 28
7	September 12
8	September 10
9	September 18
10	September 21
11	September 15
12	September 17
13	September 16
14	September 8
15	December 20
16	August 16
17	September 22
18	August 8
19	September 27
20	September 13
21	September 23
22	September 25
23	August 30
24	December 29
25	September 26
26	July 8
27	August 15
28	September 24
29	December 21
30	August 17
31	August 28
32	August 9
33	August 31
34	August 10
35	July 1
36	August 29
37	December 30
38	August 23
39	August 22
40	August 24
41	July 10
42	July 6
43	August 14
44	July 27
45	September 28
46	July 2
47	July 17
48	August 18
49	July 11
50	August 2
51	July 25
52	August 1
53	July 20
54	August 12
55	August 20
56	December 27
57	July 9
58	August 21
59	July 26
60	July 18
61	December 19
62	July 15
63	August 3
64	July 21
65	July 16
66	August 7
67	July 14
68	July 12
69	July 19
70	August 27
71	October 1
72	August 11
73	June 28
74	July 24
75	August 19
76	July 28
77	July 22
78	July 23
79	October 2
80	October 4
81	August 4
82	October 3
83	August 25
84	August 5
85	December 18
86	June 29
87	July 29
88	August 26
89	August 6
90	October 5
91	July 30
92	July 31
93	June 30
94	February 14
95	September 29
96	September 7
97	June 27
98	September 11
99	June 1
100	October 10
101	September 6
102	November 1
103	August 13
104	July 13
105	May 24
106	June 21
107	November 21
108	November 20
109	June 22
110	September 30
111	June 26
112	June 20
113	June 2
114	May 23
115	November 2
116	June 15
117	June 14
118	September 5
119	June 25
120	October 6
121	October 11
122	December 17
123	December 12
124	December 22
125	September 1
126	July 3
127	May 22
128	June 7
129	November 15
130	October 25
131	June 8
132	November 16
133	October 12
134	June 24
135	February 22
136	June 18
137	October 7
138	June 16
139	December 1
140	June 23
141	June 3
142	October 18
143	October 8
144	November 8
145	February 15
146	November 7
147	March 1
148	June 5
149	June 12
150	May 15
151	October 24
152	May 17
153	June 17
154	May 18
155	December 16
156	October 26
157	September 4
158	October 9
159	October 15
160	May 10
161	October 17
162	November 9
163	June 4
164	May 16
165	June 19
166	June 6
167	December 14
168	November 19
169	June 10
170	May 20
171	October 16
172	May 21
173	February 8
174	November 3
175	November 14
176	December 2
177	April 4
178	November 17
179	January 4
180	November 11
181	November 5
182	November 6
183	December 15
184	March 17
185	March 2
186	November 4
187	February 2
188	November 30
189	November 18
190	March 22
191	March 3
192	June 9
193	June 11
194	October 23
195	October 14
196	October 20
197	March 21
198	January 5
199	October 19
200	May 1
201	May 5
202	December 3
203	September 3
204	October 28
205	October 22
206	February 1
207	February 7
208	March 23
209	December 6
210	May 2
211	January 11
212	January 25
213	May 11
214	October 27
215	March 20
216	November 10
217	March 8
218	March 15
219	December 5
220	March 9
221	December 4
222	May 3
223	February 16
224	May 4
225	March 16
226	April 12
227	February 23
228	February 9
229	October 21
230	November 12
231	May 12
232	April 5
233	May 19
234	December 7
235	June 13
236	January 12
237	May 14
238	January 18
239	April 26
240	February 12
241	March 7
242	March 14
243	May 8
244	March 28
245	May 9
246	April 2
247	February 10
248	January 24
249	September 2
250	April 25
251	February 21
252	October 29
253	April 3
254	March 29
255	February 28
256	March 30
257	April 20
258	February 20
259	May 25
260	April 11
261	April 18
262	December 13
263	March 10
264	April 6
265	March 4
266	April 19
267	March 6
268	January 6
269	January 26
270	April 27
271	March 24
272	January 10
273	March 27
274	April 24
275	January 23
276	March 5
277	February 24
278	December 8
279	March 18
280	March 25
281	April 17
282	March 12
283	December 10
284	April 10
285	May 6
286	December 11
287	March 11
288	May 7
289	January 17
290	May 31
291	April 7
292	February 27
293	March 19
294	February 6
295	October 30
296	February 11
297	April 8
298	March 26
299	February 3
300	April 16
301	April 14
302	April 22
303	October 13
304	April 21
305	January 31
306	February 17
307	January 20
308	April 23
309	November 29
310	January 19
311	April 15
312	March 31
313	February 25
314	November 13
315	January 14
316	April 28
317	January 27
318	December 9
319	May 30
320	November 22
321	February 26
322	February 18
323	January 30
324	January 22
325	January 3
326	January 7
327	February 4
328	April 9
329	February 5
330	May 28
331	February 19
332	April 30
333	May 29
334	April 29
335	January 21
336	January 29
337	May 26
338	January 8
339	January 28
340	January 9
341	May 13
342	February 13
343	April 13
344	January 16
345	March 13
346	January 15
347	May 27
348	January 13
349	July 5
350	December 31
351	December 23
352	April 1
353	November 23
354	November 28
355	October 31
356	November 27
357	November 24
358	November 25
359	November 26
360	December 26
361	January 2
362	July 4
363	December 24
364	January 1
365	December 25
366	February 29

For a broader perspective on births around the world, see our visualization of how many babies are born every hour by country.

Learn More on the Voronoi App

If you enjoyed this visualization, check out Total Fertility Rates By Country on the Voronoi app.