Spanish Lake is an unincorporated community and census-designated place in St. Louis County, Missouri, United States. The population was 18,413 at the 2020 census. The Spanish Lake community is located in the northeastern portion of St. Louis County. The community is bounded by the Mississippi River to the east, the Missouri River to the north, High…Spanish Lake is an unincorporated community and census-designated place in St. Louis County, Missouri, United States. The population was 18,413 at the 2020 census. The Spanish Lake community is located in the northeastern portion of St. Louis County. The community is bounded by the Mississippi River to the east, the Missouri River to the north, Highway 367 to the west, and Interstate 270 to the south.
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