Minneapolis is the largest city in the U.S. state of Minnesota and is the county seat of Hennepin County. The city lies on both banks of the Mississippi River, just north of the river’s confluence with the Minnesota River, and adjoins Saint Paul, the state's capital. Known as the Twin Cities, these two form the core of Minneapolis-St. Paul, the sixteenth-largest metropolitan area in the United States, with 3.5 million residents. The United States Census Bureau estimated the city's population at 377,392 people in 2007. The city is abundantly rich in water with over twenty lakes and wetlands, the Mississippi riverfront, creeks and waterfalls, many connected by parkways in the Chain of Lakes and the Grand Rounds Scenic Byway. Minneapolis was once the world's flour milling capital and a hub for timber, and today is the primary business center between Chicago, Illinois, and Seattle, Washington. Among America's most literate cities, Minneapolis has cultural organizations that draw creative people and audiences to the city for theater, visual art, writing, and music. The community's diverse population has a long tradition of charitable support through progressive public social programs and through private and corporate philanthropy. The name Minneapolis is attributed to the city's first schoolmaster, who combined mni, the Dakota word for water, and polis, the Greek word for city. Minneapolis is nicknamed the City of Lakes and the Mill City.