Coordinates: 32°57′13″N 96°53′25″W. Carrollton is a city in Dallas, Denton, and Collin counties in the U.S. state of Texas. [3] . As of the 2020 census, its population was 133,434, making it the 27th-most populous city in Texas. [5] History. Carrollton (c. 1910–1930)