| Name | Patron | Date | Location | County | Photograph |
| 1 | Catholic Church (Botkins, Ohio)#School|Botkins Elementary School] | N/A | 1921 | Botkins: Main St.
| Shelby | |
| 2 | Nativity of the [Blessed Virgin Mary Catholic Church|Cassella Catholic Church and Rectory] | Nativity of the Blessed Virgin Mary | 1858 | Mercer County, Ohio|Marion Township]: State Route 119 in Cassella
| Mercer | |
| 3 | Chickasaw School and Rectory | N/A | 1904 | Chickasaw: Maple St.
| Mercer | |
| 4 | | Holy Trinity | 1899 | Coldwater: E. Main and 2nd Sts.
| Mercer | |
| 5 | Egypt Catholic Church and Rectory | St. Joseph | 1887 | Auglaize County, Ohio|Jackson Township]: junction of Minster-Egypt Rd. and State Route 364 at Egypt
| Auglaize | |
| 6 | Glynwood Catholic Church | St. Patrick | 1883 | Moulton Township: 6 miles northeast of St. Marys on Glynwood Rd. in Glynwood
| Auglaize | |
| 7 | Gruenwald Convent | N/A | 1854 | Mercer County, Ohio|Marion Township]: 0.5 miles south of Cassella
| Mercer | |
| 8 | Holy Family Catholic Church | Holy Family | 1866 | Wayne Township, [Darke County, Ohio|Wayne Township]: State Route 185 at Darke County, Ohio|Frenchtown]
| Darke | |
| 9 | Holy Rosary Catholic Church | Holy Rosary | 1867 | St. Marys: junction of E. Spring and S. Pine Sts.
| Auglaize | |
| 10 | Immaculate Conception Catholic Church Complex | Immaculate Conception | 1903 | Celina: Anthony and Walnut Sts.
| Mercer | |
| 11 | Immaculate Conception Rectory at Botkins | Immaculate Conception | 1887 | Botkins: 116 N. Mill St.
| Shelby | |
| 12 | St. [John the Baptist Catholic Church (Maria Stein, Ohio)|Maria Stein Catholic Church and Rectory] | St. John the Baptist | 1889 | Marion Township: St. John's Rd. and State Route 119 in Maria Stein
| Mercer | |
| 13 | Maria Stein Convent | N/A | 1846 | Marion Township: St. John's and Rolfes Rd. in Maria Stein
| Mercer | |
| 14 | Minster Elementary School | N/A | 1904 | Minster: Lincoln St.
| Auglaize | |
| 15 | | St. Mary | 1871 | Butler Township: Philothea Rd & Tangeman Rd in Philothea, between St. Henry and Coldwater
| Mercer | |
| 16 | Sacred Heart of Jesus Rectory | Sacred Heart of Jesus | 1911 | Van Buren Township, [Shelby County, Ohio|Van Buren Township]: State Routes 29 and 119 at McCartyville
| Shelby | |
| 17 | St. Aloysius Catholic Church | St. Aloysius | 1875 | Marion Township: U.S. Route 127 and State Route 274, west of Carthagena
| Mercer | |
| 18 | St. Anthony Catholic Church, Padua | St. Anthony | 1869 | Washington Township: State Route 49 and St. Anthony Rd. in Padua
| Mercer | |
| 19 | St. Augustine Catholic Church | St. Augustine | 1848 | Minster: N. Hanover St.
| Auglaize | |
| 20 | | St. Bernard | 1906 | Burkettsville: Main St.
| Mercer | |
| 21 | St. Charles Seminary and Chapel | St. Charles | 1906 | Marion Township: 0.5 miles south of Carthagena, off U.S. Route 127
| Mercer | |
| 22 | St. Francis Catholic Church and Rectory | St. Francis | 1906 | Granville Township: Cranberry and Ft. Recovery-Minster Rd. in Cranberry Prairie
| Mercer | |
| 23 | St. Henry Catholic Church | St. Henry | 1897 | St. Henry: Main St.
| Mercer | |
| 24 | St. John Catholic Church and Parish Hall | St. John | 1850 | Pusheta Township: southwestern corner of Schlemel and Van Buren Sts. in Fryburg
| Auglaize | |
| 25 | St. Joseph Catholic Church and Rectory | St. Joseph | 1866 | Recovery Township: Sawmill and St. Joe Rds. in St. Joe
| Mercer | |
| 26 | St. Joseph Catholic Church and School | St. Joseph | 1899 | Wapakoneta: 309 S. Perry St.
| Auglaize | |
| 27 | St. Louis Catholic Church and Rectory | St. Louis | 1914 | North Star: east of U.S. Route 127
| Darke | |
| 28 | St. Michael Catholic Church Complex | St. Michael | 1849 | Fort Loramie: State Route 705 east of State Route 66
| Shelby | |
| 29 | St. Nicholas Catholic Church and Rectory | St. Nicholas | 1907 | Osgood: State Route 705 and Washington St.
| Darke | |
| 30 | St. Patrick Catholic Church and Rectory | St. Patrick | 1915 | Shelby County, Ohio|Van Buren Township]: Hoying and Wright-Puthoff Rds. in St. Patrick
| Shelby | |
| 31 | St. Paul's Catholic Church and Rectory | St. Paul | 1889 | Gibson Township: junction of Sharpsburg and Meiring Rds. in Sharpsburg
| Mercer | |
| 32 | St. Peter Catholic Church and Rectory | St. Peter | 1904 | Recovery Township: St. Peter and Philothea Rds. in St. Peter
| Mercer | |
| 33 | St. Remy Catholic Church | St. Remy | 1890 | Russia: Main St. and Russia-Versailles Rd.
| Shelby | |
| 34 | St. Rose Catholic Church Complex | St. Rose | 1892 | Marion Township: Main St. in St. Rose
| Mercer | |
| 35 | [St. Sebastian's Catholic Church (Sebastian, Ohio)|St. Sebastian Catholic Church and Rectory] | St. Sebastian | 1904 | Marion Township: Sebastian Rd. and State Route 716A in Sebastian
| Mercer | |
| 36 | [St. Wendelin's Catholic Church|St. Wendelin Catholic Church, School, and Rectory] | St. Wendelin | 1870 | Recovery Township: Ft. Recovery-Minster Rd. and Township Line in Wendelin
| Mercer | |