Collinsville, AL has a population of 1,943 and is the 11,187th largest city in the United States. The population density is 496 per sq mi which is 439% higher than the Alabama average and 448% higher than the national average. The median age in Collinsville is 34 which is approximately 11% lower than the Alabama average of 39. In Collinsville, 50% of the population over 15 years of age are married, 63% speak English and 37% speak Spanish. 52% of Collinsville residents were born in Alabama, 18% were born out of state, 0% were born outside of the United States and 29% were foreign born.