Buffalo, TX has a population of 1,954 and is the 11,158th largest city in the United States. The population density is 415 per sq mi which is 328% higher than the Texas average and 358% higher than the national average. The median age in Buffalo is 33 which is approximately 2% lower than the Texas average of 34. In Buffalo, 53% of the population over 15 years of age are married, 65% speak English and 35% speak Spanish. 71% of Buffalo residents were born in Texas, 14% were born out of state, 0% were born outside of the United States and 15% were foreign born.