# National Register of Historic Places listings in Mercer County, Ohio

This is a list of the National Register of Historic Places listings in Mercer County, Ohio.
This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Mercer County, Ohio, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map.
There are 30 properties and districts listed on the National Register in the county.
This National Park Service list is complete through NPS recent listings posted February 28, 2025.
Download coordinates as:
* KML
* GPX (all coordinates)
* GPX (primary coordinates)
* GPX (secondary coordinates)

## Current listings

| | Name on the Register | Image | Date listed | Location | City or town |
| 1 | Cassella Catholic Church and Rectory | Cassella Catholic Church and Rectory More images | July 26, 1979 (#79002822) | State Route 119 in Cassella 40°24′24″N 84°33′03″W﻿ / ﻿40.406667°N 84.550833°W﻿ / 40.406667; -84.550833﻿ (Cassella Catholic Church and Rectory) | Marion Township |
| 2 | Celina Main Street Commercial Historic District | Celina Main Street Commercial Historic District More images | November 30, 1982 (#82001474) | Roughly bounded by Walnut, W. Livingston, Ash, and Warren Sts. 40°32′58″N 84°34′15″W﻿ / ﻿40.549444°N 84.570833°W﻿ / 40.549444; -84.570833﻿ (Celina Main Street Commercial Historic District) | Celina |
| 3 | Chickasaw School and Rectory | Chickasaw School and Rectory More images | July 26, 1979 (#79002848) | Maple St. 40°26′10″N 84°29′35″W﻿ / ﻿40.436111°N 84.493056°W﻿ / 40.436111; -84.493056﻿ (Chickasaw School and Rectory) | Chickasaw |
| 4 | Coldwater Catholic Church Complex | Coldwater Catholic Church Complex | July 26, 1979 (#79002832) | E. Main and 2nd Sts. 40°28′49″N 84°37′42″W﻿ / ﻿40.480278°N 84.628333°W﻿ / 40.480278; -84.628333﻿ (Coldwater Catholic Church Complex) | Coldwater |
| 5 | Fort Recovery Site | Fort Recovery Site More images | November 10, 1970 (#70000509) | State Route 49 40°24′50″N 84°46′51″W﻿ / ﻿40.413889°N 84.780833°W﻿ / 40.413889; -84.780833﻿ (Fort Recovery Site) | Fort Recovery |
| 6 | Matthias Gast House and General Store | Matthias Gast House and General Store | December 29, 1978 (#78002139) | State Route 119 in Maria Stein 40°24′28″N 84°28′13″W﻿ / ﻿40.407778°N 84.470278°W﻿ / 40.407778; -84.470278﻿ (Matthias Gast House and General Store) | Marion Township |
| 7 | Sen. Thomas J. Godfrey House | Sen. Thomas J. Godfrey House | November 26, 1980 (#80003159) | 602 W. Market St. 40°32′56″N 84°34′50″W﻿ / ﻿40.548889°N 84.580556°W﻿ / 40.548889; -84.580556﻿ (Sen. Thomas J. Godfrey House) | Celina |
| 8 | Grand Lake St. Marys Lighthouse | Grand Lake St. Marys Lighthouse | June 2, 1982 (#82003614) | Grand Lake St. Marys-Northwood Addition, east of Celina 40°32′36″N 84°28′53″W﻿ / ﻿40.543333°N 84.481389°W﻿ / 40.543333; -84.481389﻿ (Grand Lake St. Marys Lighthouse) | Jefferson Township |
| 9 | Gruenwald Convent | Gruenwald Convent | July 26, 1979 (#79002813) | 0.5 miles south of Cassella 40°24′01″N 84°33′03″W﻿ / ﻿40.400278°N 84.550833°W﻿ / 40.400278; -84.550833﻿ (Gruenwald Convent) | Marion Township |
| 10 | Immaculate Conception Catholic Church Complex | Immaculate Conception Catholic Church Complex More images | July 26, 1979 (#79002833) | Anthony and Walnut Sts. 40°33′07″N 84°34′22″W﻿ / ﻿40.551944°N 84.572778°W﻿ / 40.551944; -84.572778﻿ (Immaculate Conception Catholic Church Complex) | Celina |
| 11 | Maria Stein Catholic Church and Rectory | Maria Stein Catholic Church and Rectory More images | July 26, 1979 (#79002828) | St. John's Rd. and State Route 119 in Maria Stein 40°24′29″N 84°28′22″W﻿ / ﻿40.408056°N 84.472778°W﻿ / 40.408056; -84.472778﻿ (Maria Stein Catholic Church and Rectory) | Marion Township |
| 12 | Maria Stein Convent | Maria Stein Convent More images | May 6, 1976 (#76001490) | St. John's and Rolfes Rd. in Maria Stein 40°24′57″N 84°28′34″W﻿ / ﻿40.415833°N 84.476111°W﻿ / 40.415833; -84.476111﻿ (Maria Stein Convent) | Marion Township |
| 13 | Mendon Town Hall | Mendon Town Hall | December 29, 1978 (#78002140) | S. Main St. 40°40′23″N 84°31′07″W﻿ / ﻿40.673056°N 84.518611°W﻿ / 40.673056; -84.518611﻿ (Mendon Town Hall) | Mendon |
| 14 | Morvilius Opera House | Morvilius Opera House | February 3, 2022 (#100007396) | 101 North Wayne St. 40°24′48″N 84°46′47″W﻿ / ﻿40.4132°N 84.7796°W﻿ / 40.4132; -84.7796﻿ (Morvilius Opera House) | Fort Recovery |
| 15 | Otis Hospital | Otis Hospital | November 25, 1980 (#80003160) | 441 E. Market St. 40°32′58″N 84°33′52″W﻿ / ﻿40.549333°N 84.564444°W﻿ / 40.549333; -84.564444﻿ (Otis Hospital) | Celina |
| 16 | Philothea Catholic Church and Priest House | Philothea Catholic Church and Priest House | July 26, 1979 (#79002823) | Philothea Rd. in Philothea, between St. Henry and Coldwater 40°27′03″N 84°39′18″W﻿ / ﻿40.450833°N 84.655°W﻿ / 40.450833; -84.655﻿ (Philothea Catholic Church and Priest House) | Butler Township |
| 17 | Calvin E. Riley House | Calvin E. Riley House | November 30, 1978 (#78002137) | 130 E. Market St. 40°32′55″N 84°34′10″W﻿ / ﻿40.548611°N 84.569444°W﻿ / 40.548611; -84.569444﻿ (Calvin E. Riley House) | Celina |
| 18 | St. Aloysius Catholic Church | St. Aloysius Catholic Church More images | July 26, 1979 (#79002824) | U.S. Route 127 and State Route 274, west of Carthagena 40°26′11″N 84°34′12″W﻿ / ﻿40.436389°N 84.57°W﻿ / 40.436389; -84.57﻿ (St. Aloysius Catholic Church) | Marion Township |
| 19 | St. Anthony Catholic Church, Padua | St. Anthony Catholic Church, Padua More images | July 26, 1979 (#79002821) | State Route 49 and St. Anthony Rd. in Padua 40°30′32″N 84°47′07″W﻿ / ﻿40.508889°N 84.785278°W﻿ / 40.508889; -84.785278﻿ (St. Anthony Catholic Church, Padua) | Washington Township |
| 20 | St. Bernard Catholic Church and Rectory | St. Bernard Catholic Church and Rectory More images | July 26, 1979 (#79002842) | Main St. 40°21′08″N 84°38′45″W﻿ / ﻿40.352222°N 84.645833°W﻿ / 40.352222; -84.645833﻿ (St. Bernard Catholic Church and Rectory) | Burkettsville |
| 21 | St. Charles Seminary and Chapel | St. Charles Seminary and Chapel More images | July 26, 1979 (#79002840) | 0.5 miles south of Carthagena, off U.S. Route 127 40°25′57″N 84°33′48″W﻿ / ﻿40.4325°N 84.563333°W﻿ / 40.4325; -84.563333﻿ (St. Charles Seminary and Chapel) | Marion Township |
| 22 | St. Francis Catholic Church and Rectory | St. Francis Catholic Church and Rectory | July 26, 1979 (#79002837) | Cranberry and Ft. Recovery-Minster Rd. in Cranberry Prairie 40°23′34″N 84°34′55″W﻿ / ﻿40.392778°N 84.581944°W﻿ / 40.392778; -84.581944﻿ (St. Francis Catholic Church and Rectory) | Granville Township |
| 23 | St. Henry Catholic Church | St. Henry Catholic Church More images | July 26, 1979 (#79002829) | Main St. 40°25′03″N 84°38′15″W﻿ / ﻿40.4175°N 84.6375°W﻿ / 40.4175; -84.6375﻿ (St. Henry Catholic Church) | St. Henry |
| 24 | St. Joseph Catholic Church and Rectory | St. Joseph Catholic Church and Rectory | July 26, 1979 (#79002820) | Sawmill and St. Joe Rds. in St. Joe 40°25′41″N 84°44′19″W﻿ / ﻿40.428056°N 84.738611°W﻿ / 40.428056; -84.738611﻿ (St. Joseph Catholic Church and Rectory) | Recovery Township |
| 25 | St. Paul's Catholic Church and Rectory | St. Paul's Catholic Church and Rectory | July 26, 1979 (#79002827) | Junction of Sharpsburg and Meiring Rds. in Sharpsburg 40°22′02″N 84°42′41″W﻿ / ﻿40.367222°N 84.711389°W﻿ / 40.367222; -84.711389﻿ (St. Paul's Catholic Church and Rectory) | Gibson Township |
| 26 | St. Peter Catholic Church and Rectory | St. Peter Catholic Church and Rectory | July 26, 1979 (#79002831) | St. Peter and Philothea Rds. in St. Peter 40°27′03″N 84°44′48″W﻿ / ﻿40.450833°N 84.746667°W﻿ / 40.450833; -84.746667﻿ (St. Peter Catholic Church and Rectory) | Recovery Township |
| 27 | St. Rose Catholic Church Complex | St. Rose Catholic Church Complex More images | July 26, 1979 (#79002838) | Main St. in St. Rose 40°24′26″N 84°30′53″W﻿ / ﻿40.407222°N 84.514722°W﻿ / 40.407222; -84.514722﻿ (St. Rose Catholic Church Complex) | Marion Township |
| 28 | St. Sebastian Catholic Church and Rectory | St. Sebastian Catholic Church and Rectory More images | July 26, 1979 (#79002830) | Sebastian Rd. and State Route 716A in St. Sebastian 40°26′39″N 84°31′00″W﻿ / ﻿40.444167°N 84.516667°W﻿ / 40.444167; -84.516667﻿ (St. Sebastian Catholic Church and Rectory) | Marion Township |
| 29 | St. Wendelin Catholic Church, School, and Rectory | St. Wendelin Catholic Church, School, and Rectory More images | July 26, 1979 (#79002885) | Ft. Recovery-Minster Rd. and Township Line in Wendelin 40°24′00″N 84°41′27″W﻿ / ﻿40.4°N 84.690833°W﻿ / 40.4; -84.690833﻿ (St. Wendelin Catholic Church, School, and Rectory) | Recovery Township |
| 30 | Wallischeck Homestead | Wallischeck Homestead | November 27, 1978 (#78002138) | North of Fort Recovery 40°26′40″N 84°48′05″W﻿ / ﻿40.444444°N 84.801389°W﻿ / 40.444444; -84.801389﻿ (Wallischeck Homestead) | Recovery Township |