Glen Allen is a village in central Bollinger County in Southeast Missouri, United States, located near the intersection of State Highway 34 and Route ZZ just west of Marble Hill.

[5] In the early morning hours of April 5, 2023, an EF-2 tornado ripped through Glen Allen causing widespread destruction and a number of injuries, including five fatalities.

However, the U.S. Post Office is officially "Glenallen", spelled the same as the original company station of the St. Louis Iron Mountain & Southern Railway.

Today locals uniformly refer to this location as "Glen Allen", as does the U.S. Census Bureau.

According to the United States Census Bureau, the village has a total area of 0.06 square miles (0.16 km2), all land.

The racial makeup of the village was 96.47% White, 1.18% Black or African American, and 2.35% from two or more races.

The racial makeup of the town was 91.03% White, 5.52% Native American, and 3.45% from two or more races.