Welcome to Collin County, one of the fastest growing counties in Texas and the nation. More than 1,000,000 people and growing. Collin County is located in North Texas, just north of Dallas, with the county seat located in the city of McKinney. Collin County is part of the Dallas-Fort Worth-Arlington, TX Metropolitan Statistical Area. A small portion of the city of Dallas is also located in the county. Area: 848 sq. miles of land, 38 sq. miles of water Towns and Cities: 27 Estimated Population (2019): 1,034,730 New residents moving in each day (2019): 88 Paved County Roads: 726 miles Median Household Income (2019): $96,134 Average Home Value (2020): $374,202 County Tax Rate (2014): $0.172531 per $100 assessed value Independent School Districts: 21 Special Districts: 2 Hospital Districts: None County-level Elected Officials: 38 Registered Voters (2016): 650,134 Voter Turnout (November 2020): 75%