The Collinsville Green is the focal point of an almost intact 19th-century mill town. It extends from Main Street to South Street and is bordered on the south by the Congregational Church; the east and west with houses built in the 1840s; and the north by commercial buildings built during the mid to late 19th century. This compact urban setting provides definite enclosure for the green, making it appear smaller than it is.

The Congregational Church is the dominant element. It sits at the end of the green facing Main Street. The green was laid out as a rectangular greensward with paths crossing it diagonally in the form of an X. Today those paths have been widened and paved. The result is a paved street (also known as Church Street) with triangular traffic islands at each end and elongated triangular greenswards along each side in front of the dwellings on the street.

Yet it still retains its original form and the houses built along the green in the 1840s are extant and well-maintained, as is the green. The two small triangles of greensward at each end of the green are each landscaped with flower beds and a single plum tree. The triangle near Main Street is crossed by a concrete walkway and has granite curbs; the triangle near South Street has neither walkways nor curbs and is slightly smaller than the northern triangle. At the center of the northern triangle a standard street sign (green metal with white lettering mounted on a steel post) faces the north and the south identifying "The Green." The greenswards on the east and west sides of the green have lights (electrifying lanterns on posts) along the concrete walkways and crab-apple trees along the pavements. There are no curbs at the pavement.