Falls City, TX has a population of 665 and is the 17,776th largest city in the United States. The population density is 745 per sq mi which is 669% higher than the Texas average and 723% higher than the national average. The median age in Falls City is 38 which is approximately 12% higher than the Texas average of 34. In Falls City, 67% of the population over 15 years of age are married, 91% speak English and 8% speak Spanish. 93% of Falls City residents were born in Texas, 7% were born out of state, 0% were born outside of the United States and 0% were foreign born.