Our trip to Phnom Penh was scheduled on a Sunday so attending a mass was included in our itinerary. Based on my research, there are only few Catholic churches in Phnom Penh since majority of people are Buddhist. St. Joseph Church is one of the few Catholic Church that I found.
It is just a small (classroom type) room, located at the second floor of a building. Amusingly, most of the parishioners are Filipinos🙂
(you may check our budget and itinerary for this trip – Thailand, Cambodia & Vietnam Tour)