| Name | Location |
| Agape Christian Family Church | Clear Lake West |
| Bethlehem Lutheran Church | Mason City |
| Calvary Alliance Church | Mason City |
| Christian Church | Clear Lake West |
| Christian Fellowship Church | Mason City |
| Church of Christ | Mason City |
| Church of Christ | Clear Lake East |
| Clear Lake Baptist Church | Clear Lake West |
| Community of Christ Church | Clear Lake East |
| Congregational Church | Clear Lake West |
| County Mission Church | Burchinal |
| Evangelical Free Church | Clear Lake West |
| Faith Baptist Church | Mason City |
| First Assembly of God Church | Mason City |
| First Baptist Church | Mason City |
| First Baptist Church | Sheffield |
| First Christian Church | Mason City |
| First Church of Christ Scientist | Clear Lake West |
| First Church of the Nazarene | Mason City |
| First Congregational United Church of Christ | Mason City |
| First Covenant Church | Mason City |
| First Presbyterian Church | Mason City |
| First Reformed Church | Thornton |
| First United Methodist Church | Mason City |
| Firth Street Church of Christ | Mason City |
| Free Methodist Church | Mason City |
| Galilean Lutheran Church | Clear Lake East |
| Grace Evangelical Free Church | Mason City |
| Grace United Methodist Church | Mason City |
| Greek Orthodox Church of the Transfiguration | Mason City |
| Holy Family Catholic Church | Mason City |
| Lake Side Church | Ventura Heights |
| Mason City Baptist Church | Mason City |
| Mason City Covenant Church | Mason City |
| Messiah Lutheran Church | Mason City |
| Methodist Church | Thornton |
| New Life Tabernacle Church | Mason City |
| Open Bible - First Church | Clear Lake West |
| Our Saviours Lutheran Church | Mason City |
| Plymouth Road Bible Church | Nora Springs |
| Prince of Peace Lutheran Church | Mason City |
| Redeemer Lutheran Church | Ventura Heights |
| Richland Lutheran Church | Thornton |
| Riverside Friends Church | Mason City |
| Rolling Acres Christian Reformed Church | Mason City |
| Saint James Lutheran Church | Mason City |
| Saint Johns Episcopal Church | Mason City |
| Saint Josephs Catholic Church | Mason City |
| Saint Michaels Catholic Church | Nora Springs |
| Saint Patricks Catholic Church | Clear Lake West |
| Saint Patricks Church | Dougherty |
| Saint Paul Evangelical Lutheran Church | Thornton |
| Saint Paul Lutheran Church | Mason City |
| Saint Peter Lutheran Church | Sheffield |
| Salvation Army Church | Mason City |
| Seventh Day Adventist Church | Mason City |
| Spirit of the Dove Church | Mason City |
| Swaledale United Methodist Church | Swaledale |
| Temple Baptist Church | Mason City |
| The Church of Jesus Christ of Latter Day Saints | Mason City |
| The Church of Jesus Christ of Latter Day Saints | Clear Lake West |
| Trinity Lutheran Church | Mason City |
| United Methodist Church | Clear Lake West |
| United Methodist Church | Sheffield |
| United Methodist Church | Nora Springs |
| United Methodist Church | Thornton |
| United Methodist Church | Clear Lake West |
| Wesley United Methodist Church | Mason City |
| Zion Lutheran Church | Clear Lake West |
| Zion Lutheran Church | Clear Lake East |
