Collin County | |
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![]() The Collin County Courthouse in McKinney | |
![]() Location within the U.S. state of Texas | |
![]() Texas's location within the U.S. | |
Coordinates: 33°11′N 96°35′W / 33.18°N 96.58°W | |
Country | ![]() |
State | ![]() |
Founded | 1846 |
Named for | Collin McKinney |
Seat | McKinney |
Largest city | Plano |
Area | |
• Total | 886 sq mi (2,290 km2) |
• Land | 841 sq mi (2,180 km2) |
• Water | 45 sq mi (120 km2) 5.1% |
Population (2020) | |
• Total | 1,064,465 |
• Estimate (2021) | 1,109,462 ![]() |
• Density | 1,200/sq mi (460/km2) |
Time zone | UTC−6 (Central) |
• Summer (DST) | UTC−5 (CDT) |
Congressional districts | 3rd, 4th, 32nd |
Website | www |
Collin County is a county in the U.S. state of Texas. It is part of the Dallas-Fort Worth-Arlington metropolitan statistical area, and a small part of Dallas is in the county. At the 2020 United States census, the county's population was 1,064,465, making it Texas's sixth-most populous county and the 43rd-largest county by population in the United States.[1] Its county seat is McKinney.[2]