Connecticut Valley Hospital Cemetery (NRIS 100002718)

Address: S of jct. of Silvermine Rd. & O'Brien Dr., Middletown, Connecticut. County/parish: Middlesex.

Added to the National Register of Historic Places August 02, 2018.

From Wikipedia:

Connecticut Valley Hospital Cemetery
The Connecticut Valley Hospital Cemetery is a historic cemetery on Silvermine Road in Middletown, Connecticut. Founded in 1878, it served as the burying ground for patients of the Connecticut General Hospital for the Insane until 1957. Its design and layout are reflective of institutional cemetery practices of the period, with uniform numbered grave markers in a modestly landscaped setting. The cemetery was listed on the National Register of Historic Places in 1982. (read more...)

National Park Service documentation: