In 1928, Glenn Worthington, the owner of a large portion of the northern segment of the battlefield, petitioned Congress to create a National Military Park at Monocacy.

Once funds were secured, 1,587 acres (6 km2) of the battlefield were acquired in the late 1970s and turned over to the National Park Service for maintenance and interpretation.

The visitor center has been relocated from the historic Gambrill Mill to a new facility on the west side of the Monocacy River.

The visitor center is the starting point for a self-guided four-mile (6 km) auto tour and 1⁄2 mile (800 m) loop walking trail.

The National Park Service has recently established a General Management Plan to further interpret the area and acquire additional land if funding can be secured.