Happy, TX has a population of 719 and is the 17,301st largest city in the United States. The population density is 678 per sq mi which is 599% higher than the Texas average and 648% higher than the national average. The median age in Happy is 36 which is approximately 4% higher than the Texas average of 34. In Happy, 68% of the population over 15 years of age are married, 84% speak English and 16% speak Spanish. 72% of Happy residents were born in Texas, 18% were born out of state, 0% were born outside of the United States and 10% were foreign born.