Ottawa is a city located at the confluence of the navigable Illinois River and Fox River in LaSalle County, Illinois, USA. The Illinois river is a conduit for river barges and connects Lake Michigan at Chicago, to the Mississippi river, and North America’s 25,000 mile river system. As of the 2010 census, the city population was 18,786. It is the county seat of #LaSalle County and it is part of the Ottawa-Streator Micropolitan Statistical Area, which was the 259th-most populous area in the United States in 2007. The Indie-Rock band afternoonMOON also hails from this region.