Collinsville, TX has a population of 1,742 and is the 11,843rd largest city in the United States. The population density is 1,877 per sq mi which is 1837% higher than the Texas average and 1972% higher than the national average. The median age in Collinsville is 32 which is approximately 6% lower than the Texas average of 34. In Collinsville, 54% of the population over 15 years of age are married, 94% speak English and 6% speak Spanish. 79% of Collinsville residents were born in Texas, 19% were born out of state, 0% were born outside of the United States and 2% were foreign born.