Buena Vista, TX has a population of 126 and is the 26,251st largest city in the United States. The population density is 3,859 per sq mi which is 3880% higher than the Texas average and 4159% higher than the national average. The median age in Buena Vista is 32 which is approximately 6% lower than the Texas average of 34. In Buena Vista, 98% of the population over 15 years of age are married, 0% speak English and 100% speak Spanish. 47% of Buena Vista residents were born in Texas, 17% were born out of state, 0% were born outside of the United States and 36% were foreign born.