Carrollton is a community in Texas, United States, in Denton, Dallas, and Collin counties. As of the 2018 census, its population was 119,087, making it Texas' 23rd-populated city. Carrollton has a total area of 37.1 square miles, of which 36.3 square miles is land and 2.19 percent or 0.81 square miles is water. In parts of three counties, Carrollton is located: Dallas County, Denton County, and Collin County.