Barnes Lake-Millers Lake was a census-designated place (CDP) in Lapeer County in the U.S. state of Michigan. The CDP was used for statistical purposes and had no legal status as a municipality. The population was 1,093 at the 2010 census. Prior to the 2020 census, the CDP was split into two CDPs: Barnes Lake and Millers Lake. The CDP was located within Deerfield Township