St. Adalbert, St. George, and Mother of Divine Grace will merge with Nativity BVM Parish on East Allegheny Avenue in Port Richmond, effective July 1.
Philadelphia Archbishop Charles Chaput announced the merger on Sunday, citing demographic shifts in the Catholic population.
Chaput also noted declining Mass attendance and the availability of priests to staff parishes.
For now, the archbishop said all churches in the former parishes will remain open and continue as worship sites.
And, at the discretion of the pastor, they can be used for weddings, funerals and ethnic devotions.
The merger is a result of the Archdiocese's Parish Area Pastoral Planning initiative.
With the completion of this merger, there will now be 214 parishes in the five-county Archdiocese.