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Iowa Highway 15 (Iowa 15) was a short state highway in Van Buren County. It ran from the Missouri state line, where it connected to Route 15 to Iowa 2 in Milton. The highway was designated on January 1, 1969, when the Iowa State Highway Commission renumbered several state highways in order to match up with adjoining highways in neighboring states. The route ceased to exist on July 1, 2003, when the Iowa Department of Transportation turned over 700 miles (1,100 km) of state highways that mostly served local traffic. While it was in service, there were two Iowa 15s in the state; the other was significantly longer and located in the northern part of the state thus avoiding confusion between the two routes.

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