Lake Cassidy, Washington

Lake Cassidy is a census-designated place (CDP) located in Snohomish County, Washington, United States. The population was 3,415 at the 2010 census.DemographicsThe population of Lake Cassidy was 3,415 at the 2010 Census. 1,880 people are male. 1,535 are female.GeographyLake Cassidy is located at coordinates . The elevation is 371 feet.According to the United States Census Bureau, the CDP has a total area of 10.8 square miles, of which, 10.6 square miles of it is land and 0.2 square miles of it is water.