Casas, TX has a population of 36 and is the 28,474th largest city in the United States. The population density is 4,009 per sq mi which is 4035% higher than the Texas average and 4325% higher than the national average. The median age in Casas is 29 which is approximately 16% lower than the Texas average of 34. In Casas, 36% of the population over 15 years of age are married, 0% speak English and 100% speak Spanish. 28% of Casas residents were born in Texas, 0% were born out of state, 0% were born outside of the United States and 72% were foreign born.