National Historic Register properties in Mercer county/parish, Ohio

• St. Bernard Catholic Church and Rectory (Burketsville)
• St. Aloysius Catholic Church (Carthagena)
• St. Charles Seminary and Chapel (Carthagena)
• Cassella Catholic Church and Rectory (Cassella)
• Gruenwald Convent (Cassella)
• Celina Main Street Commercial Historic District (Celina)
• Godfrey, Sen. Thomas J., House (Celina)
• Immaculate Conception Catholic Church Complex (Celina)
• Otis Hospital (Celina)
• Riley, Calvin E., House (Celina)
• Grand Lake St. Marys Lighthouse (Celinda)
• Chickasaw School and Rectory (Chickasaw)
• Coldwater Catholic Church Complex (Coldwater)
• St. Francis Catholic Church and Rectory (Cranberry Prairie)
• Fort Recovery Site (Fort Recovery)
• Morvilius Opera House (Fort Recovery)
• Wallischeck Homestead (Fort Recovery)
• Gast, Matthias, House and General Store (Maria Stein)
• Maria Stein Catholic Church and Rectory (Maria Stein)
• Maria Stein Convent (Maria Stein)
• Mendon Town Hall (Mendon)
• Philothea Catholic Church and Priest House (Philothea)
• St. Paul's Catholic Church and Rectory (Sharpsburg)
• St. Anthony Catholic Church, Padua (St. Anthony)
• St. Henry Catholic Church (St. Henry)
• St. Joseph Catholic Church and Rectory (St. Joe)
• St. Peter Catholic Church and Rectory (St. Peter)
• St. Rose Catholic Church Complex (St. Rose)
• St. Sebastian Catholic Church and Rectory (St. Sebastian)
• St. Wendelin Catholic Church, School, and Rectory (Wendelin)