| [2] | Name[3] | Patron | Date[3] | Location[3][4] | County[3] | Photograph |
| 1 | Botkins Elementary School | N/A | 1921 | Botkins: Main St. 40°28′8.8″N 84°10′57.5″W / 40.469111°N 84.182639°W / 40.469111; -84.182639 (Botkins Elementary School) | Shelby | |
| 2 | Cassella Catholic Church and Rectory | Nativity of the Blessed Virgin Mary | 1858 | Marion Township: State Route 119 in Cassella 40°24′24″N 84°33′3″W / 40.40667°N 84.55083°W / 40.40667; -84.55083 (Cassella Catholic Church and Rectory) | Mercer | |
| 3 | Chickasaw School and Rectory | N/A | 1904 | Chickasaw: Maple St. 40°26′10″N 84°29′35″W / 40.43611°N 84.49306°W / 40.43611; -84.49306 (Chickasaw School and Rectory) | Mercer | |
| 4 | Holy Trinity Catholic Church Complex | Holy Trinity | 1899 | Coldwater: E. Main and 2nd Sts. 40°28′49″N 84°37′42″W / 40.48028°N 84.62833°W / 40.48028; -84.62833 (Coldwater Catholic Church Complex) | Mercer | |
| 5 | Egypt Catholic Church and Rectory | St. Joseph | 1887 | Jackson Township: junction of Minster-Egypt Rd. and State Route 364 at Egypt 40°23′5″N 84°26′4″W / 40.38472°N 84.43444°W / 40.38472; -84.43444 (Egypt Catholic Church and Rectory) | Auglaize | |
| 6 | Glynwood Catholic Church | St. Patrick | 1883 | Moulton Township: 6 miles northeast of St. Marys on Glynwood Rd. in Glynwood 40°34′59″N 84°19′5″W / 40.58306°N 84.31806°W / 40.58306; -84.31806 (Glynwood Catholic Church) | Auglaize | |
| 7 | Gruenwald Convent | N/A | 1854 | Marion Township: 0.5 miles south of Cassella 40°24′1″N 84°33′3″W / 40.40028°N 84.55083°W / 40.40028; -84.55083 (Gruenwald Convent) | Mercer | |
| 8 | Holy Family Catholic Church | Holy Family | 1866 | Wayne Township: State Route 185 at Frenchtown 40°14′46″N 84°31′25″W / 40.24611°N 84.52361°W / 40.24611; -84.52361 (Holy Family Catholic Church) | Darke | |
| 9 | Holy Rosary Catholic Church | Holy Rosary | 1867 | St. Marys: junction of E. Spring and S. Pine Sts. 40°32′42″N 84°22′58″W / 40.54500°N 84.38278°W / 40.54500; -84.38278 (Holy Rosary Catholic Church) | Auglaize | |
| 10 | Immaculate Conception Catholic Church Complex | Immaculate Conception | 1903 | Celina: Anthony and Walnut Sts. 40°33′7″N 84°34′22″W / 40.55194°N 84.57278°W / 40.55194; -84.57278 (Immaculate Conception Catholic Church Complex) | Mercer | |
| 11 | Immaculate Conception Rectory at Botkins | Immaculate Conception | 1887 | Botkins: 116 N. Mill St. 40°28′9.6″N 84°10′57.8″W / 40.469333°N 84.182722°W / 40.469333; -84.182722 (Immaculate Conception Rectory at Botkins) | Shelby | |
| 12 | Maria Stein Catholic Church and Rectory | St. John the Baptist | 1889 | Marion Township: St. John's Rd. and State Route 119 in Maria Stein 40°24′29″N 84°28′22″W / 40.40806°N 84.47278°W / 40.40806; -84.47278 (Maria Stein Catholic Church and Rectory) | Mercer | |
| 13 | Maria Stein Convent | N/A | 1846 | Marion Township: St. John's and Rolfes Rd. in Maria Stein 40°24′57″N 84°28′34″W / 40.41583°N 84.47611°W / 40.41583; -84.47611 (Maria Stein Convent) | Mercer | |
| 14 | Minster Elementary School | N/A | 1904 | Minster: Lincoln St. 40°23′42″N 84°22′44″W / 40.39500°N 84.37889°W / 40.39500; -84.37889 (Minster Elementary School) | Auglaize | |
| 15 | Philothea Catholic Church and Priest House | St. Mary | 1871 | Butler Township: Philothea Rd & Tangeman Rd in Philothea, between St. Henry and Coldwater 40°27′3″N 84°39′18″W / 40.45083°N 84.65500°W / 40.45083; -84.65500 (Philothea Catholic Church and Priest House) | Mercer | |
| 16 | Sacred Heart of Jesus Rectory | Sacred Heart of Jesus | 1911 | Van Buren Township: State Routes 29 and 119 at McCartyville 40°23′42.4″N 84°15′16.6″W / 40.395111°N 84.254611°W / 40.395111; -84.254611 (Sacred Heart of Jesus Rectory) | Shelby | |
| 17 | St. Aloysius Catholic Church | St. Aloysius | 1875 | Marion Township: U.S. Route 127 and State Route 274, west of Carthagena 40°26′11″N 84°34′12″W / 40.43639°N 84.57000°W / 40.43639; -84.57000 (St. Aloysius Catholic Church) | Mercer | |
| 18 | St. Anthony Catholic Church, Padua | St. Anthony | 1869 | Washington Township: State Route 49 and St. Anthony Rd. in Padua 40°30′32″N 84°47′7″W / 40.50889°N 84.78528°W / 40.50889; -84.78528 (St. Anthony Catholic Church, Padua) | Mercer | |
| 19 | St. Augustine Catholic Church | St. Augustine | 1848 | Minster: N. Hanover St. 40°23′40″N 84°22′47″W / 40.39444°N 84.37972°W / 40.39444; -84.37972 (St. Augustine Catholic Church) | Auglaize | |
| 20 | St. Bernard Catholic Church and Rectory | St. Bernard | 1906 | Burkettsville: Main St. 40°21′8″N 84°38′45″W / 40.35222°N 84.64583°W / 40.35222; -84.64583 (St. Bernard Catholic Church and Rectory) | Mercer | |
| 21 | St. Charles Seminary and Chapel | St. Charles | 1906 | Marion Township: 0.5 miles south of Carthagena, off U.S. Route 127 40°25′57″N 84°33′48″W / 40.43250°N 84.56333°W / 40.43250; -84.56333 (St. Charles Seminary and Chapel) | Mercer | |
| 22 | St. Francis Catholic Church and Rectory | St. Francis | 1906 | Granville Township: Cranberry and Ft. Recovery-Minster Rd. in Cranberry Prairie 40°23′34″N 84°34′55″W / 40.39278°N 84.58194°W / 40.39278; -84.58194 (St. Francis Catholic Church and Rectory) | Mercer | |
| 23 | St. Henry Catholic Church | St. Henry | 1897 | St. Henry: Main St. 40°25′3″N 84°38′19″W / 40.41750°N 84.63861°W / 40.41750; -84.63861 (St. Henry Catholic Church) | Mercer | |
| 24 | St. John Catholic Church and Parish Hall | St. John | 1850 | Pusheta Township: southwestern corner of Schlemel and Van Buren Sts. in Fryburg 40°30′57.5″N 84°8′54.6″W / 40.515972°N 84.148500°W / 40.515972; -84.148500 (St. John Catholic Church and Parish Hall) | Auglaize | |
| 25 | St. Joseph Catholic Church and Rectory | St. Joseph | 1866 | Recovery Township: Sawmill and St. Joe Rds. in St. Joe 40°25′41″N 84°44′19″W / 40.42806°N 84.73861°W / 40.42806; -84.73861 (St. Joseph Catholic Church and Rectory) | Mercer | |
| 26 | St. Joseph Catholic Church and School | St. Joseph | 1899 | Wapakoneta: 309 S. Perry St. 40°34′4″N 84°11′43″W / 40.56778°N 84.19528°W / 40.56778; -84.19528 (St. Joseph Catholic Church and School) | Auglaize | |
| 27 | St. Louis Catholic Church and Rectory | St. Louis | 1914 | North Star: east of U.S. Route 127 40°19′29″N 84°34′13″W / 40.32472°N 84.57028°W / 40.32472; -84.57028 (St. Louis Catholic Church and Rectory) | Darke | |
| 28 | St. Michael Catholic Church Complex | St. Michael | 1849 | Fort Loramie: State Route 705 east of State Route 66 40°21′5″N 84°22′19″W / 40.35139°N 84.37194°W / 40.35139; -84.37194 (St. Michael Catholic Church Complex) | Shelby | |
| 29 | St. Nicholas Catholic Church and Rectory | St. Nicholas | 1907 | Osgood: State Route 705 and Washington St. 40°20′26″N 84°29′33″W / 40.34056°N 84.49250°W / 40.34056; -84.49250 (St. Nicholas Catholic Church and Rectory) | Darke | |
| 30 | St. Patrick Catholic Church and Rectory | St. Patrick | 1915 | Van Buren Township: Hoying and Wright-Puthoff Rds. in St. Patrick 40°22′13.1″N 84°17′19″W / 40.370306°N 84.28861°W / 40.370306; -84.28861 (St. Patrick Catholic Church and Rectory) | Shelby | |
| 31 | St. Paul's Catholic Church and Rectory | St. Paul | 1889 | Gibson Township: junction of Sharpsburg and Meiring Rds. in Sharpsburg 40°22′2″N 84°42′41″W / 40.36722°N 84.71139°W / 40.36722; -84.71139 (St. Paul's Catholic Church and Rectory) | Mercer | |
| 32 | St. Peter Catholic Church and Rectory | St. Peter | 1904 | Recovery Township: St. Peter and Philothea Rds. in St. Peter 40°27′3″N 84°44′48″W / 40.45083°N 84.74667°W / 40.45083; -84.74667 (St. Peter Catholic Church and Rectory) | Mercer | |
| 33 | St. Remy Catholic Church | St. Remy | 1890 | Russia: Main St. and Russia-Versailles Rd. 40°14′0.68″N 84°24′53.25″W / 40.2335222°N 84.4147917°W / 40.2335222; -84.4147917 (St. Remy Catholic Church) | Shelby | |
| 34 | St. Rose Catholic Church Complex | St. Rose | 1892 | Marion Township: Main St. in St. Rose 40°24′26″N 84°30′53″W / 40.40722°N 84.51472°W / 40.40722; -84.51472 (St. Rose Catholic Church Complex) | Mercer | |
| 35 | St. Sebastian Catholic Church and Rectory | St. Sebastian | 1904 | Marion Township: Sebastian Rd. and State Route 716A in Sebastian 40°26′41.65″N 84°31′1.13″W / 40.4449028°N 84.5169806°W / 40.4449028; -84.5169806 (St. Sebastian Catholic Church and Rectory) | Mercer | |
| 36 | St. Wendelin Catholic Church, School, and Rectory | St. Wendelin | 1870 | Recovery Township: Ft. Recovery-Minster Rd. and Township Line in Wendelin 40°24′0″N 84°41′27″W / 40.40000°N 84.69083°W / 40.40000; -84.69083 (St. Wendelin Catholic Church, School, and Rectory) | Mercer | |