How Many People Are Named Ontario?
An estimated 846 people in the United States have the first name Ontario. It is almost exclusively a male name. The average bearer is 33 years old, and Ontario peaked in popularity in 1991 with 35 births that year.
Below you will find a full statistical profile of Ontario 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 Ontario paired with any surname.
Estimated Living Americans
846
About 1 in 405,147 people in the U.S.
Rarity
Very Rare
Predicted Gender
Male
100.0% confidence
Average Age
33
years old
Peak Year
1991
35 births
Total Registered
877
since 1880
Gender Distribution for Ontario
Ontario is almost exclusively a male name. Out of 877 total births registered, 100.0% were male.
Ontario as a male name
Ranked #10,601 in 2024
7 male births in 2024
Peak: 1991 (35 births)
Ontario: Popularity Over Time
SSA records for Ontario span from the 1960s to the 2020s, covering 7 decades of naming data. The most popular decade for this name was the 1990s, when 225 babies were registered. Ontario has declined significantly from its peak in the 1990s. Recent registrations are a fraction of what they were at the name's height.
Ontario by Decade
How has Ontario 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.
Ontario by State
Birth registrations for Ontario span all 5 states and territories in the SSA database. The highest counts are in Georgia, Mississippi, Louisiana. The lowest are in South Carolina, North Carolina, Louisiana. On average, about 11 Ontarios were registered per state.
Ontario + Last Name Combinations
How many people share a full name with Ontario as the first name? Click a combination below to see the estimate, or search any pairing.
Names Similar to Ontario
Other first names starting with O with a similar number of bearers.
Ontario: Questions and Answers
How many people in the U.S. are named Ontario?
We estimate approximately 846 people named Ontario 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 405,147 Americans share this first name.
Is Ontario a common name?
Ontario is classified as "Very Rare" and is more popular than 89% of all first names in the SSA database. A total of 877 births have been registered with this name since 1880.
When was Ontario most popular?
Ontario reached peak popularity in 1991, when 35 babies were given this name. The average age of a living person named Ontario is approximately 33 years old, reflecting when the name was most commonly given.
Is Ontario a male name?
Ontario is predominantly male. 100.0% of people with this name are male. See the gender breakdown above for full details.
How many Ontario Smiths are there?
To find how many people share a specific full name, we combine first name and surname frequencies. Try: Ontario Smith, Ontario Johnson, Ontario 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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