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Washington County Illinois Cities/Towns - Addieville, Ashley, Beaucoup, Covington, Du Bois, Hoyleton, Irvington, Johannisburg, Lively Grove, Nashville (County Seat), New Minden, Oakdale, Okawville, Plum Hill, Radom, Richview, Venedy

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Washington County is a county located in the U.S. state of Illinois. As of 2016, the population was 14,154. Its county seat is Nashville.

Washington County was formed in 1818. It was named for George Washington.

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