Stockton is a village in Jo Daviess County, Illinois, United States. The population was 1,728 at the 2020 census. The village of Stockton is t…Stockton is a village in Jo Daviess County, Illinois, United States. The population was 1,728 at the 2020 census. The village of Stockton is the youngest village in Jo Daviess County. It was established after the Minnesota Northwestern Railroad decided to build a station in Section 2 of Stockton Township in 1886, which through mergers later became named the Chicago Great Western Railway. The railroad tracks were removed in the early 1970s.