Rio is a village in Knox County, Illinois, United States. It had a population of 220 at the 2010 census and is part of the Galesburg Micropolitan Statistical Area. Rio is pronounced "Rye-Oh". Rio is situated in the northwest corner of Knox County, 13 miles north of Galesburg, the county seat. Like other rural neighbors, the village has rich soil ideal for farm…Rio is a village in Knox County, Illinois, United States. It had a population of 220 at the 2010 census and is part of the Galesburg Micropolitan Statistical Area. Rio is pronounced "Rye-Oh". Rio is situated in the northwest corner of Knox County, 13 miles north of Galesburg, the county seat. Like other rural neighbors, the village has rich soil ideal for farming corn and soybeans. A few small, unnamed creeks run through its outskirts, and a few small hills that coast under the streets of the village. A few sizable dropoffs throughout the land almost look like shallow or gradual cliffs as some local agricultural fields are rolling and steep. The land drains to North Henderson Creek, a west-flowing stream leading to Henderson Creek to the Mississippi River near Oquawka.
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