NY 189 was assigned to its current alignment as part of the 1930 renumbering of state highways in New York and has remained untouched since.

Over the next 1.5 miles (2.4 km), NY 189 passes through highly isolated areas of Clinton County dominated by patches of forests interspersed with small clearings.

The route continues north through the western portion of the small community,[3] passing by the former site of NY 189's U.S. Customs and Border Protection station, once located in what is now a clearing south of Broad Street.

[3][4] The route's second and last intersection in Churubusco is with Broad Street, which links NY 189 to the more populated eastern half of the hamlet.

North of Churubusco, NY 189 passes through more forests and fields and serves only a small amount of isolated residences and farms.