About Saint Mary's Roman Catholic Church of Downtown
Saint Mary's Roman Catholic Church of Downtown is a Catholic church located at 646 MONROE STREET, Detroit, MI, 48226. Saint Mary's Roman Catholic Church of Downtown was founded in 1885. You can reach Saint Mary's Roman Catholic Church of Downtown at +13139618711.
Patron saint of Saint Mary's Roman Catholic Church of Downtown
Other churches named after Saint Mary's
5 other churches named in honor of Saint Mary's are indexed in Churches List. The most-reviewed of those appear below.
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Catholic · Columbus, OH
Saint Mary's Church
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Episcopal · Jacksonville, FL
Saint Mary's Episcopal Church
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Episcopal · Phoenix, AZ
Saint Mary's Episcopal Church
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Catholic · Wausau, WI
Saint Mary's Roman Catholic Oratory
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Catholic · Detroit, MI
St. Mary's of Redford
St. Mary Roman Catholic Church (Detroit)
St. Mary Roman Catholic Church, formally the Church of the Immaculate Conception of the Blessed Virgin Mary, is in the third oldest Roman Catholic parish in Detroit, Michigan. Designed by German-born Peter Dederichs and built for the formerly ethnic German parish of the 19th century, it is located at 646 Monroe Street in what is now considered the heart of the Greektown Historic District in downtown Detroit. It is often called "Old St. Mary's Church" to avoid confusion with other St. Mary's parishes: in the Redford neighborhood of Detroit, or in nearby Royal Oak, Monroe, or Wayne.
Where is Saint Mary's Roman Catholic Church of Downtown located?
Saint Mary's Roman Catholic Church of Downtown is located at 646 MONROE STREET, Detroit, MI, 48226. The building sits at coordinates 42.33556, -83.04048, placing it in Detroit, MI 48226.
Location is approximate — drawn from the public street address.
- Public paid parking 171 ft
- St Antoine Street Lot 174 ft
- Public parking 217 ft
- 707 E. Lafayette Street 308 ft
- Public paid parking 318 ft
- Lafayette / St Antoine NS (WB) 249 ft
- Stop Position 272 ft
- Stop Position 328 ft
- Lafayette / St Antoine (EB) 351 ft
- Chrysler / Lafayette (SB) 600 ft
- Red Smoke Barbeque 243 ft
- Monroe St. Steakhouse 305 ft
- Pegasus Taverna · greek 312 ft
- New Parthenon · greek 377 ft
- Europa Cafe · international 390 ft
Nearby places drawn from OpenStreetMap, May 27, 2026.
The neighborhood around Saint Mary's Roman Catholic Church of Downtown
The ZIP code 48226 area around Saint Mary's Roman Catholic Church of Downtown is home to 6,926 residents with a median household income of $71,875 and a median age of 33.7 years, according to the US Census Bureau's 2022 American Community Survey 5-year estimates.
US Census Bureau, American Community Survey 2022 five-year estimates.
What to expect at a service at Saint Mary's Roman Catholic Church of Downtown
Roman Catholic parishes follow a structured liturgy called the Mass, celebrated worldwide in the same order.
- Mass lasts about an hour and includes Scripture readings, a homily, hymns, and Holy Communion.
- Visitors are welcome. Only baptized Catholics in good standing receive Communion; others come forward with arms crossed for a blessing.
- Dress is modest but not formal — business casual is typical for Sunday Mass.
Generalized notes for first-time visitors. Individual churches vary — when in doubt, ask a greeter at the door.
Churches in the same diocese as Saint Mary's Roman Catholic Church of Downtown
Saint Mary's Roman Catholic Church of Downtown shares an ecclesiastical jurisdiction with 5 other parishes indexed in Churches List.
- Saint Peter & Paul Jesuit Church Detroit, MI
- Most Blessed Sacrament Detroit, MI
- Assumption Grotto Detroit, MI
- St. Josaphat Detroit, MI
- Saint Josaphats Church Rectory Detroit, MI
Churches founded the same year as Saint Mary's Roman Catholic Church of Downtown
5 other churches with a documented founding year of 1885 are indexed in Churches List.
- All Saints Keokuk, IA
- Church of the Epiphany Chicago, IL
- Evangelical Covenant Church Chicago, IL
- Evangelical Covenant Church Chicago, IL
- Covenant Baptist Church Chicago, IL
Your Sunday at Saint Mary's Roman Catholic Church of Downtown
Saint Mary's Roman Catholic Church of Downtown by the numbers
Questions and answers about Saint Mary's Roman Catholic Church of Downtown
- What denomination is Saint Mary's Roman Catholic Church of Downtown?
- This church is part of the Catholic tradition.
- Where is Saint Mary's Roman Catholic Church of Downtown located?
- Saint Mary's Roman Catholic Church of Downtown is located at 646 MONROE STREET, Detroit, MI, 48226.
- When was Saint Mary's Roman Catholic Church of Downtown founded?
- Founded in 1885.
Photographs of Saint Mary's Roman Catholic Church of Downtown
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Photographs via Wikimedia Commons. Click through for author and licence.
Visitor notes about Saint Mary's Roman Catholic Church of Downtown
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