 There is 6,614 housing units at an average density of 302.1 per square mile (116.7/km2) sconce .The ethnic composition of the population of Southlake, TX is composed of 23,274 White residents (80%), 2,409 Asian residents (8.28%), 1,781 Hispanic residents (6.12%), 959 Black residents (3.3%), and 550 Two+.There were 6,414 households, out of which 60.5% had children under the age of 18 living with them, 88.0% were married couples living together, 3.5% had a female householder with no husband present, and 7.1% were non-families.