Lucas is a city in Collin County, Texas, United States.

[5] Lucas is located in south central Collin County and is bordered by Fairview to the north, Allen to the west, Parker to the southwest, Wylie to the south, St. Paul to the southeast, Wylie again to the southeast, and Lavon Lake to the east.

[6] [8] As of the 2020 United States census, there were 7,612 people, 2,590 households, and 2,170 families residing in the city.

At the 2000 census there were 2,890 people in 945 households, including 855 families, in the city.

The six school districts are as follows: The private Lucas Christian Academy is also in the city.