Our parish is the only Roman Catholic Parish in Denville, NJ. We are located on the west bound side of Rt. 46 and are easily accessible by car. We were started as a mission of St. Cecilia's Parish in Rockaway, NJ in 1926, and established as a parish in 1941. We are complete as a parish, having a parochial, preparatory grammar school and an extensive CCD program as well as all the dynamic organizations you would expect to find in a parish. Feel welcome to browse our site, you will have a more complete picture of the vibrant community here at St. Mary's . We sincerely invite you to visit us and to join us in our worship. Any question, give us a call at 973-627-0269!