Lago Vista, TX has a population of 6,505 and is the 5,460th largest city in the United States. The population density is 464 per sq mi which is 378% higher than the Texas average and 412% higher than the national average. The median age in Lago Vista is 53 which is approximately 55% higher than the Texas average of 34. In Lago Vista, 68% of the population over 15 years of age are married, 87% speak English and 11% speak Spanish. 50% of Lago Vista residents were born in Texas, 38% were born out of state, 2% were born outside of the United States and 9% were foreign born.