By 1863, population growth during the Civil War era increased the number of Barrington residents to 300. In order to provide a tax mechanism to finance improvements, Barrington submitted its request for incorporation in 1863. Delays due to the Civil War resulted in the appropriate incorporation deeds not returning to Barrington for nearly two years. The Illinois legislature granted Barrington's charter on February 16, 1865. The Village held its first Board meeting on March 20, 1865 and appointed resident Homer Wilmarth as Mayor for one year.