St. Mary's Church in Rahway, NJ was founded in 1854 (as listed in the Archdiocese of Newark archives) but the red Gothic architecture edifice was not completed until 1888. It was designed by Jeremiah O' Rourke who is responsible for a couple of other church architectures within the state. It features a long nave lined with clerestory stained-glass windows on each side depicting significant events from the bible. The round entrance opening as well as the round windows are reminiscent of Romanesque influence on an otherwise Gothic structure.

Adjacent to the current church is the Jack and Margaret Myers Senior Residence which used to be the former St. Mary's Convent. The former convent was demolished in April 2010. Around this time, the Archdiocese of Newark also merged the parishes of St. Mary's  and nearby St. Mark's to form the Divine Mercy Parish under Fr. Dennis Kaelin. The demolition of the former St. Marks church started earlier halfway through 2018. A new administrator Fr. Alexander Cruz was installed in the beginning of 2018 and will become it's new pastor on March 23, 2019. He is currently assisted by Fr. Robert Lamirez. Fr. Jose Saltarin serves as weekend assistance for the Spanish masses held in the parish.