About St. Leo · Casselton, North Dakota
St. Leo's Catholic Church is a Roman Catholic parish located in Casselton, North Dakota, a small farming community approximately 25 miles west of Fargo. The parish belongs to the Diocese of Fargo and currently serves its congregation under the pastoral leadership of Rev. Sean Mulligan. The parish offers weekend Masses on Saturday evening and alternating Sunday mornings, and it maintains a presence online through a website, Facebook page, and YouTube channel, sharing weekly bulletins and livestreamed content with parishioners near and far.
- Patron
- St. Leo (the Great)
- Rector
- Rev. Sean Mulligan
- Diocese
- Diocese of Fargo
Why belong here
St. Leo's welcomes Catholics and visitors to its Casselton parish for a Saturday Vigil Mass at 5:00 PM and Sunday Masses alternating between 8:30 AM and 10:30 AM, allowing congregants flexibility in fulfilling their Sunday obligation. The parish keeps parishioners connected through an active website, weekly bulletins, a Facebook page, and a YouTube channel that shares liturgical content with members near and far. As a small, tight-knit farming-community parish within the Diocese of Fargo, St. Leo's offers a familiar, community-rooted Catholic life for families in the area.
Mass times at St. Leo
Weekly Mass schedule
About St. Leo's Catholic Church
St. Leo's Catholic Church is a Roman Catholic parish in Casselton, North Dakota, a small farming community about 25 miles west of Fargo. The parish is part of the Diocese of Fargo and sits in Deanery 2 (Fargo) of the diocese. Its mailing address is PO Box 340, Casselton, ND 58012, with the church located at 211 Langer Ave N. The parish can be reached by phone at (701) 347-4609 or by email at [email protected], and its current pastor is Rev. Sean Mulligan, who can also be contacted at [email protected].
Clergy & Staff
The parish is currently served by Rev. Sean Mulligan as Pastor. Father Mulligan's bio is linked from the parish website, and he can be reached at his personal email [email protected].
- Rev. Sean Mulligan — Pastor
Weekly Bulletins
St. Leo's publishes a weekly bulletin with parish announcements, the liturgical calendar, and Mass intentions. Recent bulletins (including dates such as April 19, 2026; April 26, 2026; May 2026 issues; and June 2026 issues, along with bulletin inserts) are archived on the parish website's Bulletins page for parishioners to reference.
- Weekly bulletins posted at stleosnd.org/page1.html
Online & Social Media Presence
The parish maintains a presence online through its website, Facebook page, and YouTube channel, allowing parishioners near and far to stay connected with the parish's liturgical and community life.
- Official website: http://stleosnd.org
- Facebook: facebook.com/st.LeoCatholic.casselton
- YouTube channel: youtube.com/channel/UC3aN_OQdQ_Lo4fWq5szFvQw
Diocese of Fargo Affiliation
St. Leo's is one of the parishes in the Diocese of Fargo, North Dakota. The diocese was established in 1889 as the Diocese of Jamestown and later renamed the Diocese of Fargo. St. Leo's belongs to Deanery 2 (Fargo Deanery) alongside other area parishes such as the Cathedral of St. Mary (Fargo), Holy Spirit (Fargo), Nativity (Fargo), Sts. Anne and Joachim (Fargo), St. Paul's Newman Center (Fargo), Blessed Sacrament (West Fargo), Holy Cross (West Fargo), St. Benedict (Horace), St. Maurice (Kindred), and St. Thomas (Buffalo).
- Diocese: Diocese of Fargo
- Deanery: Deanery 2 (Fargo)
Contact & Visit
Parishioners and visitors can reach St. Leo's by phone, email, or in person at the parish office. The parish encourages those interested in learning more to consult the weekly bulletin or its online channels.
- Address: 211 Langer Ave N, PO Box 340, Casselton, ND 58012
- Phone: (701) 347-4609
- Email: [email protected]