[1] The Common is located in the center of the main village of Union, a rural inland community of coastal Knox County.

Facing Town House Road is the 18-foot (5.5 m) granite American Civil War memorial, placed in 1888 by the local chapter of the Grand Army of the Republic.

At the southeast corner of that section is a small cement watering trough, and a wooden 1940s map of the area.

[2] The westernmost eastern section is mostly open, with maple trees around the fringe, and an octagonal Queen Anne style bandstand in the southern half, built in 1895.

The land that makes up the present common had apparently been laid out by 1801, and was purchased from David Gillmor in 1809 for $100, then a significant sum of money.