Lake Dallas is a city in Denton County, Texas, United States. The population was 7,105 at the 2010 census.GeographyLake Dallas is located at .According to the United States Census Bureau, the city has a total area of 7.0km2, of which 6.2km2 is land and 0.8km2, or 11.03%, is water.DemographicsAs of the census of 2000, there were 6,166 people, 2,261 households, and 1,666 families residing in the city. The population density was 2,693.5 people per square mile (1,039.6/km²). There were 2,338 housing units at an average density of 1,021.3 per square mile (394.2/km²). The racial makeup of the city was 89.51% White, 3.32% African American, 0.63% Native American, 0.94% Asian, 0.02% Pacific Islander, 3.84% from other races, and 1.74% from two or more races. Hispanic or Latino of any race were 9.83% of the population.There were 2,261 households out of which 43.4% had children under the age of 18 living with them, 56.9% were married couples living together, 12.3% had a female householder with no husband present, and 26.3% were non-families. 20.4% of all households were made up of individuals and 5.4% had someone living alone who was 65 years of age or older. The average household size was 2.72 and the average family size was 3.17.