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- Co-Cathedral of the Nativity of the Blessed Virgin Mary Catholic (Latin rite) · House of prayer
- Hunter River Presbyterian Church House of prayer
- St. Augustine's Roman Catholic Church Catholic (Latin rite) · House of prayer
- St. Columban Church Catholic (Latin rite) · House of prayer · 42 Fifth Street West
- Evangelical Christian Spiritual Church Church · 305 Thirteenth Street West Today 10:00
- Blessed Sacrement Parish Catholic (Latin rite) · House of prayer · 321 Tollgate Road East
- Calvary Baptist Church Baptist · Church
- Christ Church Seaway Anglican · Church
- Church of Christ Church
- Clyde River Presbyterian Church Reformed and Presbyterian · House of prayer
- Cornwall Seventh Day Adventist Church Adventist · Church
- Cornwall Wesleyan Church Methodist and Holiness · House of prayer
- Faith Apostolic Church Pentecostal and Charismatic · Church
- Fellowship Baptist Church Baptist · Church
- First Baptist Church Baptist · Church · 310 York Street
- Fountaingate Christian Assembly House of prayer
- Harvest Christian Fellowship Church
- Immanuel Christian Reformed Church Reformed and Presbyterian · Church
- Kingdom Hall of Jehovah's Witnesses House of prayer
- Knox-St. Paul's United Church Church
- Lifecentre Cornwall Church
- Long Sault Pentecostal Church Pentecostal and Charismatic · Church
- Paroisse Sainte-Thérèse-de-Lisieux Catholic (Latin rite) · Church · 1304 Lisieux Street
- Precious Blood Catholic Church Catholic (Latin rite) · Church
- Saint Mark's Anglican Church House of prayer
- Salem United Church House of prayer
- St. Andrews Catholic Church Catholic (Latin rite) · House of prayer
- St. Andrews Presbyterian Reformed and Presbyterian · House of prayer
- St. Andrew's Presbyterian Church Reformed and Presbyterian · Church
- St Andrew's - St Mark's United Church Church · 20 Johnson Crescent
- St. Andrew's United Church Church
- St Felix De Valois Church Catholic (Latin rite) · House of prayer
- St. Francis de Sales Catholic Church Catholic (Latin rite) · Church · 434 Second Street West
- St. John's Presbyterian Church Reformed and Presbyterian · Church
- St. Mary's Catholic Church Catholic (Latin rite) · Church
- St. Matthew's Lutheran Church Lutheran · Church · 1509 Second Street West
- St. Peter's Catholic Church Catholic (Latin rite) · Church
- St. Pius X Roman Catholic Church Catholic (Latin rite) · Church
- St. William Catholic Church Catholic (Latin rite) · Church
- The Church of Jesus Christ of Latter-day Saints Other restorationist · Church · 500 Cornwall Centre Road
- Trinity Anglican Church Anglican · Church
- West River United Church House of prayer · 10 Church Street