Stacy is a city in Chisago County, Minnesota, United States, along the Sunrise River. The population was 1,456 at the 2010 census. Intersta…Stacy is a city in Chisago County, Minnesota, United States, along the Sunrise River. The population was 1,456 at the 2010 census. Interstate 35 serves as a main route for the community. A post office called Stacy has been in operation since 1873. Stacy was laid out in 1875, and named for Dr. Stacy B. Collins, an early settler.