Pioneer Junction is a census-designated place (CDP) in Lincoln County, Montana, United States.

[3] The community is south of the center of Lincoln County, along U.S. Route 2.

It is bordered to the north by the White Haven CDP.

According to the U.S. Census Bureau, the Pioneer Junction CDP has an area of 3.5 square miles (9.1 km2), all land.

This Lincoln County, Montana state location article is a stub.