Collinsville was named for Charles Collins, a wagonmaker who bought the first town lot.
It lies at the intersection of U.S. Route 127 and State Route 73. Collinsville has a distinct history regarding its population: The total population of the entire town has never exceeded 140 souls. Every ten years during the census – since 1950, the ending population has always been 140. Also, the entire town, is exactly one mile in circumference. The tallest building is a corn silo.