| Adams Elementary School | Jamesville | Building | 2025 |
| Alexander, John, Wheat Warehouse | Milton | Building | 1978 |
| Allen, Abram, House | Milton | Building | 1978 |
| Armory, The | Janesville | Building | 1978 |
| Bartlett Memorial Historical Museum | Beloit | Building | 1977 |
| Beloit Power Plant | Beloit | Building | 2017 |
| Beloit Water Tower | Beloit | Building | 1983 |
| Benton Avenue Historic District | Janesville | District | 1996 |
| Blodgett, Selvy, House | Beloit | Building | 1980 |
| Bluff Street Historic District | Beloit | District | 1983 |
| Bostwick Avenue Historic District | Janesville | District | 2006 |
| Brasstown Cottage | Beloit | Building | 1983 |
| Church of St. Thomas the Apostle | Beloit | Building | 1983 |
| Citizens Bank | Clinton | Building | 1985 |
| City of Beloit Waterworks and Pump Station | Beloit | District | 1990 |
| Clark-Brown House | Beloit | Building | 1985 |
| Clinton Village Hall | Clinton | Building | 1985 |
| Clinton Water Tower | Clinton | Structure | 1985 |
| Columbus Circle Historic District | Janesville | District | 2005 |
| Conrad Cottages Historic District | Janesville | District | 1993 |
| Cooksville Cheese Factory | Evansville | Building | 1980 |
| Cooksville Historic District | Cooksville | District | 1973 |
| Cooksville Historic District (Boundary Increase) | Cooksville | District | 1980 |
| Cooksville Mill and Mill Pond Site | Evansville | Site | 1980 |
| Cooper-Gillies House | Evansville | Building | 1980 |
| Courier Building | Milton | Building | 2015 |
| Court Street Methodist Church | Janesville | Building | 1977 |
| Courthouse Hill Historic District | Janesville | District | 1986 |
| Crist, J. W., House | Beloit | Building | 1983 |
| Crosby Block | Clinton | Building | 1985 |
| Crosby, James B., House | Janesville | Building | 1995 |
| Culton, Charles L., House | Edgertown | Building | 1977 |
| De Jean House | Milton | Building | 1978 |
| DeLong, Homer B., House | Clinton | Building | 1985 |
| Dean, Erastus, Farmstead | Janesville | Building | 1978 |
| Dow, John T., House | Evansville | Building | 1980 |
| Eager Free Public Library | Evansville | Building | 1977 |
| Eager, Almeron, Funerary Monument and Plot | Evansville | Object | 2011 |
| East Milwaukee Street Historic District | Janesville | District | 1980 |
| Edgerton Depot | Edgerton | Building | 1998 |
| Edgerton Post Office | Edgerton | Building | 2000 |
| Edgerton Public Grade Schools | Edgerton | Building | 1987 |
| Emerson Hall | Beloit | Building | 1979 |
| Evansville Historic District | Evansville | District | 1978 |
| Evansville Standpipe | Evansville | Structure | 2008 |
| Fairbanks Flats | Beloit | Building | 1983 |
| First Congregational Church | Beloit | Building | 1975 |
| Footville Condensery | Footville | Building | 1982 |
| Footville State Bank | Footville | Building | 1982 |
| Fredendall Block | Janesville | Building | 1982 |
| Fulton Congregational Church | Fulton | Building | 1976 |
| Fulton Street Historic District | Edgerton | District | 1999 |
| Gempeler Round Barn | Orfordville | Building | 1979 |
| Gifford House | Milton | Building | 1978 |
| Gilley-tofsland Octagonal Barn | Edgerton | Building | 1979 |
| Goodrich Blacksmith Shop | Milton | Building | 1978 |
| Goodrich, Ezra and Elizabeth, House | Milton | Building | 2015 |
| Goodrich-Buten House | Milton | Building | 1978 |
| Gray, William H. and Edith, Farmstead | Milton | Building | 2015 |
| Greenman, Reynolds and Lois, House | Milton | Building | 2016 |
| Grove Street Historic District | Evansville | District | 2011 |
| Hanchett Block | Beloit | Building | 1980 |
| Haven-Crandall House | Milton | Building | 2016 |
| Hilton House Hotel | Beloit | Building | 2003 |
| How-Beckman Mill NHL | Beloit | Building | 1977 |
| Hugunin, John and Martha, House | Janesville | Building | 2005 |
| Janesville Cotton Mill | Janesville | Building | 1980 |
| Janesville High School | Janesville | Building | 1999 |
| Janesville Public Library | Janesville | Building | 1981 |
| Janesville Pumping Station | Janesville | Building | 1985 |
| Jefferson Avenue Historic District | Janesville | District | 2006 |
| Jones, John H., House | Janesville | Building | 2008 |
| Jones, Samuel S., Cobblestone House | Clinton | Building | 1978 |
| Kinney Farmstead-Tay-e-he-Dah Site | Edgerton | Building | 1978 |
| LaPrairie Grange Hall No. 79 | Janesville | Building | 1977 |
| Lappin-Hayes Block | Janesville | Building | 1976 |
| Lathrop-Munn Cobblestone House | Beloit | Building | 1977 |
| Leonard-Leota Park | Evansville | District | 2012 |
| Look West Historic District | Janesville | District | 1987 |
| Look West Historic District (Boundary Increase) | Janesville | District | 1993 |
| Lovejoy and Merrill-Nowlan Houses | Janesville | Building | 1980 |
| Masonic Temple | Milton | Building | 2015 |
| McEwan, Peter, Warehouse | Milton | Building | 1978 |
| Merchant Row Historic District | Milton | District | 2015 |
| Merrill Avenue Historic District | Beloit | District | 1993 |
| Miller House | Evansville | Building | 1980 |
| Milton College Historic District | Milton | District | 1980 |
| Milton House NHL | Milton | Building | 1972 |
| Moran's Saloon | Beloit | Building | 1983 |
| Mouth of the Yahara Archeological District | Fulton | District | 1975 |
| Murray-George House | Beloit | Building | 1985 |
| Myers, Peter, Pork Packing Plant and Willard Coleman Building | Janesville | Building | 1983 |
| Myers-Newhoff House | Janesville | Building | 1979 |
| Near East Side Historic District | Beloit | District | 1983 |
| Neese, Elbert, House | Beloit | Building | 1983 |
| North Main Street Historic District | Janesville | District | 1980 |
| North, Sterling, House | Edgerton | Building | 1997 |
| Nye, Clark, House | Beloit | Building | 1983 |
| Old Fourth Ward Historic District | Janesville | District | 1990 |
| Orfordville Depot | Orfordville | Building | 1988 |
| Owen, John and Margaret, House | Milton | Building | 2016 |
| Owen, William J., Store | Footville | Building | 1982 |
| Pangborn, J. L., House | Clinton | Building | 1985 |
| Parkview Historic District | Milton | District | 2015 |
| Payne-Craig House | Janesville | Building | 1987 |
| Pearsons Hall of Science | Beloit | Building | 1980 |
| Pomeroy and Pelton Tobacco Warehouse | Edgerton | Building | 1998 |
| Porter, J. K., Farmstead | Evansville | Building | 1980 |
| Prospect Hill Historic District | Janesville | District | 1992 |
| Randall, Brewster, House | Janesville | Building | 1984 |
| Rasey House | Beloit | Building | 1974 |
| Rau, Charles, House | Beloit | Building | 1983 |
| Richardson Grout House | Evansville | Building | 1980 |
| Richardson, Hamilton, House | Janesville | Building | 1978 |
| Richardson-Brinkman Cobblestone House | Clinton | Building | 1977 |
| Rindfleisch Building | Beloit | Building | 1983 |
| Risum Round Barn | Orfordville | Building | 1979 |
| Robinson, John C. and Mary, Farmstead | Union | Building | 2010 |
| Roosevelt Elementary School | Janesville | Building | 2025 |
| Seventh Day Baptist Church | Milton | Building | 2016 |
| Shopiere Congregational Church | Shopiere | Building | 1976 |
| Slaymaker, Stephen, House | Beloit | Building | 1983 |
| Smiley, Samuel, House | Orfordville | Building | 1982 |
| Smith, John, House | Clinton | Building | 1985 |
| South First Street Residential Historic District | Evansville | District | 2011 |
| South Main Street Historic District | Janesville | District | 1990 |
| St. John's Lutheran Church | Evansville | Building | 2012 |
| St. Paul's Episcopal Church | Beloit | Building | 1978 |
| Stark-Clint House | Tiffany | Building | 1985 |
| Stebbins, Harrison, House | Evansville | Building | 1980 |
| Strang, Soloman J., House | Footville | Building | 1982 |
| Strong Building | Beloit | Building | 1983 |
| Strong Partridge Mound Group | Beloit | Site | 1994 |
| Strunk, John and Eleanor, House | Janesville | Building | 2008 |
| Tallman House | Janesville | Building | 1970 |
| Taylor, A. E., House | Clinton | Building | 1985 |
| Turtleville Iron Bridge | Beloit | Structure | 1977 |
| Washington Elementary School | Janesville | Building | 2025 |
| West Luther Valley Lutheran Church | Ordfordville | Building | 1980 |
| West Milwaukee Street Historic District | Janesville | District | 1990 |
| Whiton-Parker House | Janesville | Building | 2016 |
| Willard, Frances, Schoolhouse | Janesville | Building | 1977 |
| Wyman-Rye Farmstead | Clinton | Building | 1977 |
| Yates, Florence, House | Beloit | Building | 1983 |