|• Total||12.62 sq mi (32.69 km2)|
|• Land||12.60 sq mi (32.64 km2)|
|• Water||0.02 sq mi (0.06 km2)|
|Elevation||568 ft (173 m)|
|• Density||410/sq mi (158.3/km2)|
|Time zone||UTC-6 (Central (CST))|
|• Summer (DST)||UTC-5 (CDT)|
|GNIS feature ID||1378618|
Lucas is located in south central Collin County at  It 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..
According to the U.S. Census Bureau, the city of Lucas has a total area of 12.6 square miles (32.7 km2), of which 0.02 square miles (0.06 km2), or 0.17%, is water.
|U.S. Decennial Census|
As of the 2010 census the population of Lucas was 5116. The ethnic and racial composition of the population was 87.9% non-Hispanic white, 1.3% non-Hispanic black, 0.9% Native American, 2.2% Asian, 0.1% non-Hispanic from some other race, 2.2% from two or more races and 6.0% Hispanic or Latino of any race.
As of the census of 2000, there were 2,890 people, 945 households, and 855 families residing in the city. The population density was 314.3 people per square mile (121.3/km2). There were 962 housing units at an average density of 104.6 per square mile (40.4/km2). The racial makeup of the city was 80.44% White, 8.42% African American, 0.52% Native American, 0.28% Asian, 0.03% Pacific Islander, 1.00% from other races, and 1.31% from two or more races. Hispanic or Latino of any race were 11.56% of the population.
There were 945 households out of which 44.9% had children under the living with them, 83.2% were married couples living together, 4.0% had a female householder with no husband present, and 9.5% were non-families. 7.5% of all households were made up of individuals and 1.8% had someone living alone who was 65 years of age or older. The average household size was 3.06 and the average family size was 3.22.
In the city, the population was spread out with 30.2% under the, 5.3% from 18 to 24, 28.8% from 25 to 44, 29.1% from 45 to 64, and 6.6% who were 65 years of age or older. The median age was 39 years. For every 100 females, there were 98.9 males. For every 100 females age 18 and over, there were 97.9 males.
The median income for a household in the city was $100,220, and the median income for a family was $101,014. Males had a median income of $72,471 versus $38,182 for females. The per capita income for the city was $34,020. About 3.9% of families and 4.1% of the population were below the poverty line, including 3.7% of those under age 18 and 5.0% of those age 65 or over.
The city of Lucas has seven different school districts and private schools within the city limits and the ETJ (Extra Terrestrial Jurisdiction) of Lucas, Texas. The six school districts are as follows:
- Lovejoy Independent School District 
- Allen Independent School District 
- McKinney Independent School District 
- Plano Independent School District 
- Princeton Independent School District 
- Wylie Independent School District 
The private Lucas Christian Academy is also in the city.
Home rule charter
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A special election for the adoption of a home rule charter was held May 10, 2008. Unofficial results showed a vote of 422 for and 108 against.
- "American FactFinder". United States Census Bureau. Retrieved 2008-01-31.
- "US Board on Geographic Names". United States Geological Survey. 2007-10-25. Retrieved 2008-01-31.
- "Geographic Identifiers: 2010 Census Summary File 1 (G001): Lucas city, Texas". U.S. Census Bureau, American Factfinder. Retrieved July 31, 2015.
- "US Gazetteer files: 2010, 2000, and 1990". United States Census Bureau. 2011-02-12. Retrieved 2011-04-23.
- "Population and Housing Unit Estimates". Retrieved June 9, 2017.
- "Census of Population and Housing". Census.gov. Retrieved June 4, 2015.
- 2010 profile of general population and housing characteristics for Lucas from the US Census