Lake Worth is a city in Tarrant County, Texas, United States. The population was 4,584 at the 2010 census. The city is adjacent to, and named after, Lake Worth, a popular recreational lake in the northwestern portion of Tarrant County.DemographicsAs of the census of 2000, there were 4,618 people, 1,660 households, and 1,233 families residing in the city. The population density was 1,831.2 people per square mile (707.5/km²). There were 1,751 housing units at an average density of 694.4/sq mi (268.3/km²). The racial makeup of the city was 88.20% White, 0.87% African American, 0.89% Native American, 0.95% Asian, 0.11% Pacific Islander, 6.17% from other races, and 2.82% from two or more races. Hispanic or Latino of any race were 14.51% of the population.There were 1,660 households out of which 33.7% had children under the age of 18 living with them, 56.6% were married couples living together, 12.9% had a female householder with no husband present, and 25.7% were non-families. 21.1% of all households were made up of individuals and 10.8% had someone living alone who was 65 years of age or older. The average household size was 2.70 and the average family size was 3.12.