Solon Mills is an unincorporated community and census-designated place in McHenry County, Illinois, United States. Solon Mills is located on U.S. Route 12, southwest of Spring Grove. Solon Mills is part of ZIP code 60071; it once had its own post office with ZIP code 60080 before it closed on September 28, 2002. It was named a CDP prior to the 2020 census which showed a population of 133.
Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.