Westlake, TX has a population of 1,124 and is the 14,433rd largest city in the United States. The population density is 168 per sq mi which is 73% higher than the Texas average and 85% higher than the national average. The median age in Westlake is 42 which is approximately 22% higher than the Texas average of 34. In Westlake, 76% of the population over 15 years of age are married, 88% speak English and 1% speak Spanish. 43% of Westlake residents were born in Texas, 46% were born out of state, 3% were born outside of the United States and 8% were foreign born.