How Many People Are Named Millie?
An estimated 24,738 people in the United States have the first name Millie. It is predominantly female (99.5%). The average bearer is 21 years old, and Millie peaked in popularity in 2024 with 2,910 births that year.
Below you will find a full statistical profile of Millie as a first name in the United States, including gender data, a year-by-year popularity timeline going back to 1880, a decade breakdown, and state-by-state birth registrations. You can also check how many people share the full name Millie paired with any surname.
Key Insights
- While Millie is overwhelmingly female, 212 male births have been registered with this name since 1880.
Estimated Living Americans
24,738
About 1 in 13,855 people in the U.S.
Rarity
Uncommon
Predicted Gender
Female
99.5% confidence
Average Age
21
years old
Peak Year
2024
2,910 births
Total Registered
42,765
since 1880
Gender Distribution for Millie
Millie is almost exclusively a female name. Out of 42,765 total births registered, 99.5% were female.
Millie as a male name
Ranked #13,425 in 2021
5 male births in 2021
Peak: 1922 (15 births)
Millie as a female name
Ranked #86 in 2024
2,910 female births in 2024
Peak: 2024 (2,910 births)
Millie: Popularity Over Time
SSA records for Millie span from the 1880s to the 2020s, covering 15 decades of naming data. The most popular decade for this name was the 2020s, when 10,871 babies were registered. Millie remains highly popular today, with recent registration numbers near its historical peak.
Millie by Decade
How has Millie tracked across different eras? The table below groups all SSA birth registrations into 10-year periods, with separate male and female counts. The colored bar shows each decade's share relative to the peak.
| Decade | Total | Male | Female | |
|---|---|---|---|---|
| 1880s | 1,527 | 0 | 1,527 | |
| 1890s | 1,959 | 0 | 1,959 | |
| 1900s | 1,995 | 6 | 1,989 | |
| 1910s | 4,190 | 67 | 4,123 | |
| 1920s | 3,978 | 103 | 3,875 | |
| 1930s | 2,633 | 26 | 2,607 | |
| 1940s | 2,282 | 5 | 2,277 | |
| 1950s | 1,932 | 0 | 1,932 | |
| 1960s | 1,289 | 0 | 1,289 | |
| 1970s | 741 | 0 | 741 | |
| 1980s | 462 | 0 | 462 | |
| 1990s | 472 | 0 | 472 | |
| 2000s | 1,575 | 0 | 1,575 | |
| 2010s | 6,859 | 0 | 6,859 | |
| 2020s | 10,871 | 5 | 10,866 | |
Millie by State
Birth registrations for Millie span all 51 states and territories in the SSA database. The highest counts are in New York, Texas, California. The lowest are in District of Columbia, Vermont, Delaware. On average, about 637 Millies were registered per state.
Millie + Last Name Combinations
How many people share a full name with Millie as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Millie
Other first names starting with M with a similar number of bearers.
Millie: Questions and Answers
How many people in the U.S. are named Millie?
We estimate approximately 24,738 people named Millie are alive in the United States today. This is based on SSA birth records from 1880 to 2024, adjusted for mortality using CDC life tables. About 1 in 13,855 Americans share this first name.
Is Millie a common name?
Millie is classified as "Uncommon" and is more popular than 98.7% of all first names in the SSA database. A total of 42,765 births have been registered with this name since 1880.
When was Millie most popular?
Millie reached peak popularity in 2024, when 2,910 babies were given this name. The average age of a living person named Millie is approximately 21 years old, reflecting when the name was most commonly given.
Is Millie a female name?
Millie is predominantly female. 99.5% of people with this name are female. See the gender breakdown above for full details.
How many Millie Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Millie Smith, Millie Johnson, Millie Williams. You can also search any combination on our homepage.
Where does this data come from?
Our estimates use Social Security Administration birth records (1880 to 2024), adjusted for survival using CDC 2023 life tables broken down by sex. The U.S. population figure (342,754,338) is from the Census Bureau's July 2025 estimate. Full methodology.
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