Eau Claire is a city located in the west-central part of the U.S. state of Wisconsin. The population was 61,704 as of the 2000 census, and a 2009 estimate puts the population at 66,278 making it the largest municipality in the northwestern portion of the state. It is the county seat of Eau Claire County, although a small portion of the city lies in neighboring Chippewa County. Eau Claire is the principal city of the Eau Claire, Wisconsin Metropolitan Statistical Area, which is a part of the Eau-Claire-Menomonie Combined Statistical Area.America's Promise named the city as one of the 100 Best Communities for Young People in 2007. Eau Claire was among the first Tree Cities in Wisconsin, having been recognized as such since 1980.