Population overview
Collin County is home to roughly 1,297,179 people, making up about 4.09% of the total population of Texas. Within the North Texas region, it ranks #3 of 36 counties by population. The combination of 848 square miles of land and 1,297,179 residents yields a density of about 1529.7 people per square mile — a clearly metropolitan figure that signals concentrated urban development and dense infrastructure.
How Collin County compares
Compared with the other 253 Texas counties, Collin County sits in the top 10% of the population distribution. It is one of the top-tier urban counties driving Texas's overall growth and economy.
| Comparison | Population | vs Collin |
|---|---|---|
| Collin County | 1,297,179 | — |
| North Texas region average | 252,448 | -81% |
| Texas county median | 18,916 | -99% |
| Largest in Texas (Harris) | 5,045,026 | +289% |
Neighboring county populations
Collin County shares borders with 6 counties. Comparing population across an adjacent corridor often reveals commuting patterns, school-district pull, and economic gravity.
| County | Seat | Population | Density |
|---|---|---|---|
| Dallas County | Dallas | 2,661,397 | 3024.3 |
| Denton County | Denton | 1,069,346 | 1204.2 |
| Grayson County | Sherman | 153,613 | 164.5 |
| Rockwall County | Rockwall | 140,738 | 944.6 |
| Hunt County | Greenville | 123,336 | 146.7 |
| Fannin County | Bonham | 39,265 | 44.0 |
Frequently asked questions
What is the population of Collin County, Texas?+
Collin County has an estimated population of 1,297,179 residents, based on the most recent U.S. Census data.
What is the population density of Collin County?+
Collin County has a population density of approximately 1529.7 people per square mile across its 848 sq mi of land area — characteristic of a highly urbanized county.
Where does Collin County rank among Texas counties by population?+
Collin County ranks #6 out of 254 Texas counties by total population, accounting for roughly 4.09% of the state's total population.
What is the most populous county near Collin County?+
Among the 6 counties bordering Collin, Dallas County is the most populous with about 2,661,397 residents.
How is Collin County's population measured?+
Population figures are sourced from the U.S. Census Bureau — the decennial census and annual American Community Survey (ACS) population estimates. See our methodology for full sourcing.