Collinsville is a town located in Dekalb County, in the state of Alabama (AL), United States. Nestled in the East South Central division of the South region, it covers an area of 3.5 square miles (9.0 km²) and sits at an elevation of 718 ft. With a population of approximately 1,644 residents, Collinsville offers a peaceful, rural atmosphere.
The town's population is composed of about 47.63% males and 52.37% females, and it has a population density of 469.71 people per square mile (181.36/km²). Collinsville lies at a latitude of 34.27 and a longitude of -85.86, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (18.5%), followed by English (5.2%), German (4%), and Scotch-Irish (2.8%) heritage. The town is identified by the ZIP code 35961.