| Acker and Evans Law Office | Ogdensburg | Building | 1983 |
| Arab Mountain Fire Observation Station | Piercefield | Structure | 2001 |
| Baldwin, Benjamin Gordon, House | Norwood | Building | 2004 |
| Bayside Cemetery and Gatehouse Complex | Potsdam | Site | 2004 |
| Brick Chapel Church and Cemetery | Canton | Building | 2005 |
| Brown, Luke, House | Parishville | Building | 2003 |
| Buck's Bridge United Methodist Church | Buck's Bridge | Building | 2004 |
| Chase Mills Inn | Chase Mills | Building | 1978 |
| Childwold Memorial Presbyterian Church | Piercefield | Building | 2001 |
| Clare Town Hall | Clare | Building | 2004 |
| Clarkson Office Building | Potsdam | Building | 2004 |
| Clarkson-Knowles Cottage | Potsdam | Building | 1995 |
| Congregational Church | Rensselaer Falls | Building | 2005 |
| Cox, Gardner, House | Hannawa Falls | Building | 1986 |
| Crossover Island Light Station | St. Lawrence | Structure | 2007 |
| Dr. Buck-Stevens House | Brasher Falls | Building | 1982 |
| Edwards Town Hall | Edwards | Building | 2004 |
| Fine Town Hall | Fine | Building | 1996 |
| Fine, Judge John, House | Ogdenburg | Building | 1986 |
| First Baptist Church of Ogdensburg Complex | Ogdensburg | Building | 2018 |
| First Congregational Church of Madrid | Madrid | Building | 2010 |
| First Presbyterian Church Complex | Gouverneur | Building | 2015 |
| First Presbyterian Church of Dailey Ridge | Potsdam | Building | 2002 |
| Ford, Jacob, House | Morristown | Building | 1982 |
| Fort La Presentation Site | Ogdensburg | Site | 2010 |
| French Family Farm | Potsdam | Building | 1982 |
| Hale Cemetery | Norfolk | Site | 2024 |
| Halfway House | Lisbon | Building | 2023 |
| Harrison Grist Mill | Morley | Building | 1982 |
| Hepburn Library | Norfolk | Building | 2004 |
| Hepburn Library of Colton | Colton | Building | 2012 |
| Hepburn Library of Lisbon | Lisbon | Building | 2016 |
| Herring-Cole Hall, St. Lawrence University | Canton | Building | 1974 |
| Hopkinton Green Historic District | Hopkinton | District | 2014 |
| Knollwood | Star Lake | Building | 2012 |
| Land Office | Morristown | Building | 1982 |
| Library Park Historic District | Ogdensburg | District | 1982 |
| Lisbon Railroad Depot | Lisbon | Building | 2000 |
| Lisbon Town Hall | Lisbon | Building | 1980 |
| Market Street Historic District | Potsdam | District | 1979 |
| Methodist Episcopal Church of East DeKalb | DeKalb | Building | 1998 |
| Miller, Paschal, House | Morristown | Building | 1982 |
| Morristown Schoolhouse | Morristown | Building | 1982 |
| New York State Armory | Ogdensburg | Building | 1976 |
| Ogdensburg Armory | Ogdensburg | Building | 1995 |
| Ogdensburg Harbor Lighthouse | Ogdensburg | Building | 2016 |
| Oswegatchie Pumping Station | Ogdensburg | Building | 1990 |
| Parmeter, Nathaniel, House | Potsdam | Building | 2003 |
| Pickens Hall | Heuvelton | Building | 2004 |
| Pierrepont Town Buildings | Pierrepont Center | Building | 1982 |
| Potsdam Civic Center Complex | Potsdam | Building | 2016 |
| Potsdam State Normal School Campus | Potsdam | Building | 2015 |
| Raymondville Parabolic Bridge | Raymondville | Structure | 1984 |
| Richardson Hall, St. Lawrence University | Canton | Building | 1974 |
| Robinson Bay Archeological District | Massena | District | 1977 |
| Russell Town Hall | Russell | Building | 1996 |
| St. Lawrence County Government Complex | Canton | District | 2024 |
| St. Lawrence University-Old Campus Historic District | Canton | District | 1983 |
| Stocking, Samuel, House | Morristown | Building | 1982 |
| Stone Windmill | Morristown | Building | 1982 |
| Sunday Rock | South Colton | Object | 2010 |
| Trinity Episcopal Chapel | Morley | Building | 1990 |
| Trinity Episcopal Church | Potsdam | Building | 2003 |
| U.S. Customshouse | Ogdensburg | Building | 1974 |
| U.S. Post Office | Ogdensburg | Building | 1977 |
| United Methodist Church | Morristown | Building | 1982 |
| United Presbyterian Church | Lisbon | Building | 2005 |
| US Post Office-Canton | Canton | Building | 1988 |
| US Post Office-Gouverneur | Gouverneur | Building | 1989 |
| US Post Office-Potsdam | Potsdam | Building | 1989 |
| Village Park Historic District | Canton | District | 1975 |
| Village Park Historic District (Boundary Increase II) | Canton | District | 2008 |
| Village Park Historic District (Boundary Increase) | Canton | District | 1983 |
| Waddington Historic District | Waddington | District | 1992 |
| Wallace, Jonathan, House | Potsdam | Building | 2003 |
| Wanakena Presbyterian Church | Wanakena | Building | 2007 |
| Watkins-Sisson House | Potsdam | Building | 2013 |
| West Stockholm Historic District | West Stockholm | District | 1979 |
| Wright's Stone Store | Morristown | Building | 1982 |
| Young Memorial Church | Brier Hill | Building | 2011 |
| Zion Episcopal Church and Rectory | Colton | Building | 2003 |
Acker and Evans Law Office Ogdensburg · Building · listed 1983 
Arab Mountain Fire Observation Station Piercefield · Structure · listed 2001 
Baldwin, Benjamin Gordon, House Norwood · Building · listed 2004 
Buck's Bridge United Methodist Church Buck's Bridge · Building · listed 2004 
Clarkson Office Building Potsdam · Building · listed 2004 
Clarkson-Knowles Cottage Potsdam · Building · listed 1995 
Cox, Gardner, House Hannawa Falls · Building · listed 1986 
Crossover Island Light Station St. Lawrence · Structure · listed 2007 
Dr. Buck-Stevens House Brasher Falls · Building · listed 1982 
First Presbyterian Church Complex Gouverneur · Building · listed 2015