How Many People Are Named Illinois?
An estimated 0 people in the United States have the first name Illinois. It is used for both genders, with 68.8% female. The average bearer is 0 years old, and Illinois peaked in popularity in 1920 with 6 births that year.
Below you will find a full statistical profile of Illinois 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 Illinois paired with any surname.
Key Insights
- Illinois is exceptionally rare. Fewer than 100 people with this name are estimated to be alive in the U.S. today.
Estimated Living Americans
0
About 1 in 1 people in the U.S.
Rarity
Very Rare
Predicted Gender
Female
68.8% confidence
Average Age
0
years old
Peak Year
1920
6 births
Total Registered
16
since 1880
Gender Distribution for Illinois
Illinois is a genuinely unisex name, used for both males (31.3%) and females (68.8%). Out of 16 total births registered, 5 were male and 11 were female.
Illinois as a male name
Ranked #4,531 in 1923
5 male births in 1923
Peak: 1923 (5 births)
Illinois as a female name
Ranked #4,630 in 1920
6 female births in 1920
Peak: 1920 (6 births)
Illinois: Popularity Over Time
SSA records for Illinois span from the 1910s to the 1920s, covering 2 decades of naming data. The most popular decade for this name was the 1920s, when 11 babies were registered. Illinois remains highly popular today, with recent registration numbers near its historical peak.
Illinois by Decade
How has Illinois 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.
Illinois + Last Name Combinations
How many people share a full name with Illinois as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Illinois
Other first names starting with I with a similar number of bearers.
Illinois: Questions and Answers
How many people in the U.S. are named Illinois?
We estimate approximately 0 people named Illinois 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 1 Americans share this first name.
Is Illinois a common name?
Illinois is classified as "Very Rare" and is more popular than 2.9% of all first names in the SSA database. A total of 16 births have been registered with this name since 1880.
When was Illinois most popular?
Illinois reached peak popularity in 1920, when 6 babies were given this name. The average age of a living person named Illinois is approximately 0 years old, reflecting when the name was most commonly given.
Is Illinois a female name?
Illinois is predominantly female. 68.8% of people with this name are female. See the gender breakdown above for full details.
How many Illinois Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Illinois Smith, Illinois Johnson, Illinois 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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