Church of the Assumption of the Blessed Virgin Mary has been in Morristown since 1848. After outgrowing its original building due to the rising Irish Catholic population in the community, a new church was built in 1873.

A fire destroyed much of the then 112-year-old church structure in 1985. Although the roof fell in, pews were damaged, and the organ was ruined by water, the marble altar and stained glass windows (1882) all survived. The Rose stained glass over the loft was the lone window to sustain damage, and was later restored. The newly restored church was re-dedicated on Feb. 29, 1988.

In 2007 Assumption Church underwent a major renovation, reducing the size of the sanctuary area to allow for more seating and moving the baptismal font to a central location.