Lake LeAnn is an unincorporated community and census-designated place in Hillsdale County in the U.S. state of Michigan. The CDP has a population of 1,571 at the 2020 census. It is located in Somerset Township and includes the namesake Lake LeAnn and several other lakes that are part of the Grand River headwaters. U.S. Route 12 runs through the southern part of the community, leading east-northeast 47 miles to Ypsilanti and west-southwest 32 miles to Coldwater.