Oregon Route 154 is an Oregon state highway running from OR 233 near Dayton to OR 153 near Hopewell. OR 154 is composed of most of the Lafayette Highway No. 154 (see Oregon highways and routes). It is 5.74 miles (9.24 km) long and runs north–south, entirely within Yamhill County. Despite the name, the Lafayette Highway does not actually reach Lafayette. However, a Yamhill County maintained "Lafayette Highway" continues past OR 18 to enter the city of Lafayette. Also, Yamhill County signs the portion of Oregon Route 153 east of the junction with OR 154 as "Lafayette Highway," as well.