Tolono is a village in Tolono Township, Champaign County, Illinois, United States. The population was 3,447 at the 2010 census. Its name was fabricated by J.B. Calhoun, land commission of the Illinois Central Railroad, who wrote about it simply: "[I] placed the vowel o three times, thus o-o-o, and filling in with the consonants t-l-n.