St. Mary's Cemetery, along with two others, the larger Immaculate Conception Cemetery and the tiny Brigham Cemetery, occupies much of the south/southwest slope of Mt. Pleasant Hill. Its main four-acre section extends down the hill from Crescent to Beach Streets along the northwestern edge of the Immaculate Conception. The one-acre rectangle of the Brigham Cemetery juts into St. Mary's from the northwest. A second, three-acre section of St. Mary's south of Beach Street abutting Clover Hill Street was added in this century, and is still open. A line of deciduous trees and a chainlink fence mark its eastern boundary with the Immaculate Conception, and more deciduous trees line a continuation of the fence along Beach Street, where tall granite posts mark the corner bounds and the center drive. This is the second Catholic cemetery in Marlborough, (the Immaculate Conception Cemetery was opened in the late 1850's), and for years it was known simply as the "French" or "French Catholic" Cemetery. Although one gravestone bears a date of 1876, it is commonly acknowledged that the first person to be buried here was Xavier Morin, in 1879. His grave marker reads "This monument was donated by the French congregation in remembrance of the first body interred in this cemetery." This cemetery sits on about 7.8 acres. In 1994 there were about 1500 headstones. The earliest death date is 1879 and is still in use.