Sudden Valley is a census-designated place just outside of Bellingham in Whatcom County, Washington. The population was 6,354 at the 2020 census, down from 6,441 at the 2010 census. Sudden Valley is the second-largest homeowner association in western Washington, with over 7,000 residents. There are eleven neighborhood parks, miles of hikin…Sudden Valley is a census-designated place just outside of Bellingham in Whatcom County, Washington. The population was 6,354 at the 2020 census, down from 6,441 at the 2010 census. Sudden Valley is the second-largest homeowner association in western Washington, with over 7,000 residents. There are eleven neighborhood parks, miles of hiking trails in woodlands and along Lake Whatcom, beaches, two pools, sports fields, tennis courts, a basketball court, a recreation center with full gym, an 18-hole golf course, a library, a marina and more.
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