Pasadena Hills is a city in St. Louis County, Missouri, United States. The population was 930 at the 2010 census. The entire city is listed on th…Pasadena Hills is a city in St. Louis County, Missouri, United States. The population was 930 at the 2010 census. The entire city is listed on the National Register of Historic Places. According to the United States Census Bureau, the city has a total area of 0.22 square miles, all land.
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