The Monroe Center green is the older triangular-shaped portion of the green. It is a park-like open space situated within what is primarily the residential section of the highest point in town located within the Monroe Center local historic district and within a National Register District. Seven streets radiate outward from it following the natural contours of the land. It is heavily shaded with mature trees, primarily maples, and furnished with semicircular beds of shrubs and seasonal flowers. On the southern tip of the green, separated from the larger triangular portion by a road, is a single tree, a flagpole, and the site of four war memorials honoring those who fought in World Wars One and Two, Korea and Vietnam.

An asphalt curb protects the edges of the new rectangular portion of the Town Hall Green situated to the west side of the older triangular greensward. It has a gazebo situated near the center; a large sign identifying the municipal offices near Fan Hall Road; a commemorative bell suspended within a low brick support near the south side of the green; the town historical marker near the north side; and a U.S. postal service drop box on the west side. Several trees including dogwood, plum and maple are randomly planted on this portion of the green. In the northwest corner are the remnants of an old stone wall.

The older, triangular portion of the green is bordered on three sides by three of the larger and most architecturally interesting buildings in the district including St. Peter's Church (1802); the Congregational Church; and the impressive Masonic Lodge (1904) that also served as the Town Hall until 1897 when a new one was built on the west side of the green. Their presence dominates the green. Three large houses on the east side are good examples of the Federal Period, Greek Revival, and late 19th century architecture. They are also examples of changes that have typically taken place around the green over the years; in the mid 19th century, two of the houses were academies, and the third served as general store and a post office.

The horizontal town hall complex at the western boundary of the new Town Hall Green provides little enclosure for that portion of the green. However, the presence of the 20th century structure in what is primarily a 19th century town center is less intrusive than it might be; and land slopes down away from the green at that point and the Town Hall is to some extent situated behind the rise.