Waseca is a city in Waseca County, Minnesota, United States. The population was 9,229 at the 2020 census. It is the county seat. Accor…Waseca is a city in Waseca County, Minnesota, United States. The population was 9,229 at the 2020 census. It is the county seat. According to the United States Census Bureau, the city has an area of 5.19 square miles ; 4.00 square miles is land and 1.19 square miles is water.
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