Mill Creek is a city in Snohomish County, Washington, United States. It is located approximately 20 miles north (NNE) of downtown Seattle. The population was 11,525 at the 2000 census. Mill Creek is a planned community built around a golf course and country club as its centerpiece.
Based on per capita income, one of the more reliable measures of affluence, Mill Creek ranks 19th of 522 areas in the state of Washington to be ranked.