How many people live in Collin County, TX?
Updated Apr. 6, 2026Refreshed annually
In 2024, there were about 1.25 million people living in Collin County, TX. That makes Collin County the 35th-most populous county in the US. It is also the sixth-largest in Texas, accounting for 4% of the state’s population.
1.25M
population of Collin County, TX (2024)
4%
County share of the Texas population (2024)
About 1.25 million people lived in Collin County, TX in 2024.
Population estimates, 2000–2024
What are Collin County, TX’s age demographics?
About 151,000 Collin County, TX residents are aged 65 and older in 2024. That represents 12% of its population. For comparison, the age group represents 14% of Texas’s population and 18% in the US overall.
Another 301,200 Collin County residents, or 24% of the population, were children under 18. For comparison, the age group represents 24.6% of Texas’s population and 21.6% in the US overall.
A lower share of Collin County, TX's population is aged 65 or older than the US as a whole.
Population estimates by age group, (2024)
What are Collin County, TX’s racial and ethnic demographics?
Non-Hispanic Asian residents make up 21.2% of the Collin County, TX population, higher than the national share of 6.5%. Collin County, TX also has a larger share of people identifying as non-Hispanic two or more races (2.6%) than the US overall (2.5%).
In contrast, Collin County’s non-Hispanic white population accounts for 47.9%, below the 57.5% nationwide, and the Hispanic population makes up 16.2% of the county, compared with 20% nationally.
Racial and ethnic make up differ based on location. These figures reflect how people identified their race alone (not in combination with other races), and separate out Hispanic or Latino ethnicity, following Census reporting standards.
Collin County, TX has a higher share of a non-Hispanic Asian population than Texas as a whole.
Population estimates by race and ethnicity, (2024)
The largest city or town in Collin County, TX is Plano with about 287,600 residents in 2024.
Cities and towns in Collin County, TX ranked by population
Population (2024), includes only portions within county
| City or town | Population | |
|---|---|---|
| 1. | Plano (pt.) | 287,591 |
| 2. | McKinney | 227,526 |
| 3. | Frisco (pt.) | 139,707 |
| 4. | Allen | 113,746 |
| 5. | Wylie (pt.) | 59,712 |
| 6. | Dallas (pt.) | 54,194 |
| 7. | Celina (pt.) | 47,363 |
| 8. | Richardson (pt.) | 42,646 |
| 9. | Princeton | 37,019 |
| 10. | Prosper (pt.) | 35,355 |
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Methodology
USAFacts standardizes data, in areas such as time and demographics, to make it easier to understand and compare.
The analysis was generated with the help of AI and reviewed by USAFacts for accuracy.
Page sources
USAFacts endeavors to share the most up-to-date information available. We sourced the data on this page directly from government agencies; however, the intervals at which agencies publish updated data vary.
