| Adams, Walker, House | Davenport | Building | 1984 |
| Adler, E. P., House | Davenport | Building | 1983 |
| Ambrose Hall (Additional Documentation) | Davenport | Building | 1977 |
| American Commercial and Savings Bank | Davenport | Building | 1983 |
| American Telephone & Telegraph Co. Bldg. | Davenport | Building | 1983 |
| Argyle Flats | Davenport | Building | 1983 |
| Ball-Waterman House | Davenport | Building | 1984 |
| Ballard, John W., House | Davenport | Building | 1983 |
| Barrows, Edward S., House | Davenport | Building | 1976 |
| Beiderbecke, Leon Bismark, House | Davenport | Building | 1977 |
| Benton, Richard, House | Davenport | Building | 1983 |
| Berg, Henry, Building | Davenport | Building | 1983 |
| Best, Louis P. and Clara K., Residence and Auto House | Davenport | Building | 2010 |
| Bethel AME Church | Davenport | Building | 1983 |
| Bettendorf, Joseph F., House | Bettendorf | Building | 1983 |
| Bettendorf-Washington School | Bettendorf | Building | 1984 |
| Blackhawk Hotel | Davenport | Building | 1983 |
| Boyle, John R., House | Davenport | Building | 1983 |
| Brammer Grocery Store | Davenport | Building | 1983 |
| Bridge Avenue Historic District | Davenport | District | 1983 |
| Brown, James, House | Riverdale | Building | 1982 |
| Brownlie, Alexander, House | Long Grove | Building | 1976 |
| Bryan, Alden, House | Davenport | Building | 1983 |
| Buchanan School | Davenport | Building | 1983 |
| Buffalo High School | Buffalo | Building | 2005 |
| Building at 1119-1121 W. Third Street | Davenport | Building | 1983 |
| Building at 202 W. Third Street | Davenport | Building | 1984 |
| Building at 813-815 W. Second Street | Davenport | Building | 1983 |
| Burdick, Anthony, House | Davenport | Building | 1984 |
| Busch, Diedrich, House | Davenport | Building | 1984 |
| Calvary Baptist Church/First Baptist Church | Davenport | Building | 1983 |
| Cameron, W. S., House | Davenport | Building | 1984 |
| Carr, William V., House | Davenport | Building | 1983 |
| Cawley, James, House | Davenport | Building | 1984 |
| Central Fire Station | Davenport | Building | 1982 |
| Central Office Building | Davenport | Building | 1983 |
| Chicago, Milwaukee, St. Paul and Pacific Freight House | Davenport | Building | 1985 |
| City Market | Davenport | Building | 1984 |
| Claussen, William, House | Davenport | Building | 1983 |
| Clifton | Davenport | Building | 1979 |
| Cody Homestead | McCausland | Building | 1974 |
| Cody Road Historic District | Le Claire | District | 1979 |
| College Square Historic District | Davenport | District | 1983 |
| Collins House | Davenport | Building | 1976 |
| Columbia Avenue Historic District | Davenport | District | 1984 |
| Community Building | Princeton | Building | 2008 |
| Cook, Clarissa, Home for the Friendless | Davenport | Building | 1983 |
| Copeland, George, House | Davenport | Building | 1984 |
| Cork Hill District | Davenport | District | 1984 |
| Cottage at 1514 and 1516 W. Second Street | Davenport | Building | 1983 |
| Crescent Warehouse Historic District | Davenport | District | 2003 |
| Currier House | Davenport | Building | 1983 |
| Davenport Bag and Paper Company Building | Davenport | Building | 2018 |
| Davenport Bank and Trust (Boundary Increase) | Davenport | Building | 2016 |
| Davenport City Hall | Davenport | Building | 1982 |
| Davenport Crematorium | Davenport | Building | 1983 |
| Davenport Downtown Commercial Historic District | Davenport | District | 2020 |
| Davenport Hose Station No. 3 | Davenport | Building | 1984 |
| Davenport Hotel | Davenport | Building | 1983 |
| Davenport Motor Row and Industrial Historic District | Davenport | District | 2019 |
| Davenport Village | Davenport | District | 1980 |
| Davenport Water Co. Pumping Station No. 2 | Davenport | Building | 1984 |
| Davison, Abner, House | Davenport | Building | 1984 |
| Dawley House | Le Claire | Building | 1979 |
| Democrat Building | Davenport | Building | 1983 |
| Dessaint, Marie Clare, House | Davenport | Building | 1984 |
| Dillon Memorial | Davenport | Structure | 1983 |
| Dils-Downer House | Davenport | Building | 1983 |
| Donahue Building | Davenport | Building | 1983 |
| East 14th Street Historic District | Davenport | District | 1983 |
| East Hill House and Carraige House | Riverdale | Building | 1999 |
| Ebeling, Arthur, House | Davenport | Building | 1984 |
| Ebeling, Henry, House | Davenport | Building | 1984 |
| Edinger, Edward, House | Davenport | Building | 1983 |
| Eldridge, D. C., House | Davenport | Building | 1984 |
| Eldridge, Theodore, House | Davenport | Building | 1984 |
| Ewert, Ferdinand, Building | Davenport | Building | 1983 |
| Fennern, Henry P., House | Davenport | Building | 1984 |
| Ficke Block | Davenport | Building | 1983 |
| Finch, Fred, House | Davenport | Building | 1983 |
| First Bible Missionary Church | Davenport | Building | 1983 |
| First Church of Christ, Scientist | Davenport | Building | 1984 |
| First Federal Savings and Loan Association Building | Davenport | Building | 2016 |
| First National Bank Building | Davenport | Building | 1983 |
| First National Bank of Davenport | Davenport | Building | 2018 |
| First Presbyterian Church | Davenport | Building | 1983 |
| Forest Grove School No. 5 | Bettendorf | Building | 2013 |
| Forrest Block | Davenport | Building | 1983 |
| French, Alice, House | Davenport | Building | 1983 |
| Frick's Tavern | Davenport | Building | 1974 |
| Gabbert, William, House | Davenport | Building | 1983 |
| Gamble, James, House | Le Claire | Building | 1979 |
| Gannon, M. V., House | Davenport | Building | 1983 |
| Gaspard, D. Julius, House | Davenport | Building | 1983 |
| Germania-Miller/Standard Hotel | Davenport | Building | 1983 |
| Glaspell, Isaac, House | Davenport | Building | 1983 |
| Goering, Jacob, House | Davenport | Building | 1983 |
| Goodrich, William T., House | Davenport | Building | 1983 |
| Gordon-Van Tine Company Historic District | Davenport | District | 2017 |
| Grilk, Charles, House | Davenport | Building | 1984 |
| Guy, Finley, Building | Davenport | Building | 1984 |
| Hall, Israel, House | Davenport | Building | 1984 |
| Hamburg Historic District | Davenport | District | 1983 |
| Hamburg Historic District | Davenport | District | 2017 |
| Hauschild's Hall | Davenport | Building | 1983 |
| Hebert, Louis, House | Davenport | Building | 1983 |
| Heinz, Bonaventura, House (second) | Davenport | Building | 1983 |
| Henne, Robert, House | Davenport | Building | 1983 |
| Hibernia Hall | Davenport | Building | 1983 |
| Hiller Building | Davenport | Building | 1974 |
| Hillside | Davenport | Building | 1982 |
| Hoersch, John, House | Davenport | Building | 1984 |
| Hoffman Building | Davenport | Building | 1983 |
| Hoffman, Samuel, Jr., House | Davenport | Building | 1983 |
| Holbrook, William, House | Davenport | Building | 1984 |
| Horton-Suiter House | Le Claire | Building | 1979 |
| Hose Station No. 1 | Davenport | Building | 1983 |
| Hose Station No. 6 | Davenport | Building | 1983 |
| Hose Station No. 7 | Davenport | Building | 1983 |
| Hotel Mississippi-RKO Orpheum Theater | Davenport | Building | 1998 |
| House at 1646 W. Second Street | Davenport | Building | 1983 |
| House at 2123 W. Second Street | Davenport | Building | 1983 |
| House at 2212 W. River Drive | Davenport | Building | 1984 |
| House at 318-332 Marquette Street | Davenport | Building | 1983 |
| House at 919 Oneida Street | Davenport | Building | 1984 |
| International Harvester Truck Sales and Service Station | Davenport | Building | 2025 |
| Iowa Reform Building | Davenport | Building | 1983 |
| Iowa Soldiers' Orphans' Home | Davenport | District | 1982 |
| Jansen, Theodore, House | Davenport | Building | 1983 |
| Kahl Building | Davenport | Building | 1983 |
| Kahl, Henry, House | Davenport | Building | 1983 |
| Kattenbracher House | Le Claire | Building | 1979 |
| Kiene, Albert, House | Davenport | Building | 1984 |
| Kimball-Stevenson House | Davenport | Building | 1983 |
| Klindt, George, House | Davenport | Building | 1983 |
| Klindt, Henry, House | Davenport | Building | 1984 |
| Koch Drug Store | Davenport | Building | 1984 |
| Koenig Building | Davenport | Building | 1983 |
| Koester, Nicholas, Building | Davenport | Building | 1983 |
| Kuhnen, Nicholas J., House | Davenport | Building | 1983 |
| LONESTAR NHL | LeClaire | Structure | 1989 |
| LeClaire, Antoine, House | Davenport | Building | 1974 |
| Lerch, Gustov C., House | Davenport | Building | 1983 |
| Lincoln School | Davenport | Building | 2002 |
| Linden Flats | Davenport | Building | 1983 |
| Lindsay, James E., House | Davenport | Building | 1984 |
| Linograph Company Building, The | Davenport | Building | 2009 |
| Lippincott, John, House | Davenport | Building | 1983 |
| Littig Brothers/Mengel & Klindt/Eagle Brewery | Davenport | Building | 1983 |
| Littig, John, House | Davenport | Building | 1984 |
| Lock and Dam No. 14 Historic District | Pleasant Valley | District | 2004 |
| Lueschen, John, House | Davenport | Building | 1984 |
| Mallet, Joseph, House | Davenport | Building | 1983 |
| Martzahn, August F., House | Davenport | Building | 1983 |
| Marycrest College Historic District | Davenport | District | 2004 |
| McBride-Hickey House | Davenport | Building | 1983 |
| McCaffrey House | Le Claire | Building | 1979 |
| McCarthy, Patrick F., House | Davenport | Building | 1984 |
| McClellan Heights Historic Dictrict | Davenport | District | 1984 |
| McHarg, Joseph S., House | Davenport | Building | 1985 |
| McKinley Elementary School | Davenport | Building | 2002 |
| McKinney House | Davenport | Building | 1983 |
| McManus House | Davenport | Building | 1983 |
| Meadly House | Davenport | Building | 1984 |
| Meiser Drug Store | Davenport | Building | 1983 |
| Middleton, Dr. George McLelland, House and Garage | Davenport | Building | 1982 |
| Miller Building | Davenport | Building | 1983 |
| Miller, F. H., House | Davenport | Building | 1983 |
| Miller, Severin, House | Davenport | Building | 1983 |
| Motie, Joseph, House | Davenport | Building | 1983 |
| Murray, Thomas, House | Davenport | Building | 1984 |
| Nebergall "Knoll Crest" Round Barn | Blue Grass | Building | 1986 |
| Newcome, Daniel T., Double House | Davenport | Building | 1983 |
| Newhall, Lucian, House | Davenport | Building | 1983 |
| Nichols, Oscar, House | Davenport | Building | 1983 |
| Nighswander, Benjamin, House | Davenport | Building | 1984 |
| Northwest Davenport Savings Bank | Davenport | Building | 1984 |
| Northwest Davenport Turner Society Hall | Davenport | Building | 1979 |
| Oak Lane Historic District | Davenport | District | 1984 |
| Oakdale Cemetery Historic District | Davenport | District | 2015 |
| Ockershausen, Henry, House | Davenport | Building | 1984 |
| Old City Hall | Davenport | Building | 1983 |
| Old Mill House | Le Claire | Building | 1979 |
| Outing Club | Davenport | Building | 1977 |
| Pahl, Henry, House | Davenport | Building | 1983 |
| Palmer, B. J., House | Davenport | Building | 1984 |
| Paulsen, Peter J., House | Davenport | Building | 1983 |
| Paustian, Henry, House | Davenport | Building | 1983 |
| Peters' Barber Shop | Davenport | Building | 1984 |
| Peters, J. C., House | Davenport | Building | 1984 |
| Petersen's, J. H. C., Sons Store | Davenport | Building | 1983 |
| Petersen, Max, House | Davenport | Building | 1979 |
| Petersen, W. D., Memorial Music Pavillion | Davenport | Structure | 1983 |
| Picklum, Frank, House | Davenport | Building | 1984 |
| Pierce School No. 13 | Davenport | Building | 1983 |
| Plambeck, Joachim, House | Davenport | Building | 1984 |
| Pohlmann, Elizabeth, House | Davenport | Building | 1984 |
| Pohlmann, Henry, House | Davenport | Building | 1984 |
| Potter-Williams House | Davenport | Building | 1984 |
| Price, Hiram/Henry Vollmer House | Davenport | Building | 1983 |
| Prien Building | Davenport | Building | 1983 |
| Priester Building, The | Davenport | Building | 2017 |
| Prospect Park Historic District | Davenport | District | 1984 |
| Putnam-Parker Block | Davenport | District | 2011 |
| Quickel, Jacob, House | Davenport | Building | 1984 |
| Radcliff, Willam, House | Davenport | Building | 1984 |
| Raible, F. J., House | Davenport | Building | 1983 |
| Rambo House | Le Claire | Building | 1979 |
| Ranzow-Sander House | Davenport | Building | 1983 |
| Raphael, Jacob, Building | Davenport | Building | 1983 |
| Regina Coeli Monastery | Bettendorf | Building | 1994 |
| Renwick Building | Davenport | Building | 1983 |
| Renwick House | Davenport | Building | 1983 |
| Riverview Terrace Historic District | Davenport | District | 1984 |
| Roberts, Edward C., House | Davenport | Building | 1984 |
| Roslyn Flats | Davenport | Building | 1983 |
| Rowhouses at 702-712 Kirkwood Boulevard | Davenport | Building | 1984 |
| Royal Neighbors of America National Home Historic District | Davenport | District | 2015 |
| Sacred Heart Roman Catholic Cathedral Complex | Davenport | Building | 1984 |
| Saengerfest Halle | Davenport | Building | 1983 |
| Schebler, Richard, House | Davenport | Building | 1983 |
| Schmidt Block | Davenport | Building | 1983 |
| Schmidt, F. Jacob, House | Davenport | Building | 1983 |
| Schmidt, Louis C. and Amelia L., House | Davenport | Building | 2007 |
| School Number 6 | Davenport | Building | 2011 |
| Schricker, John C., House | Davenport | Building | 1983 |
| Schricker, John, House | Davenport | Building | 1985 |
| Schroeder Bros, Meat Market | Davenport | Building | 1983 |
| Scott County Jail | Davenport | Building | 1983 |
| Sharon, Fred B., House | Davenport | Building | 1983 |
| Shaw, E. A., House | Davenport | Building | 1984 |
| Shields Woolen Mill | Davenport | Building | 1983 |
| Siemer House | Davenport | Building | 1977 |
| Simpson, Charles S., House | Davenport | Building | 1983 |
| Sitz, Rudolph H., Building | Davenport | Building | 1983 |
| Smith, Alvord I., House | Davenport | Building | 1983 |
| Smith, Henry H./J.H. Murphy House | Davenport | Building | 1983 |
| Smith, James, House | Davenport | Building | 1984 |
| Smith, John, House | Le Claire | Building | 1979 |
| Smith, William G., House | Davenport | Building | 1984 |
| Spencer, Roswell, House | Pleasant Valley | Building | 1982 |
| St. Anthony's Roman Catholic Church Complex | Davenport | Building | 1984 |
| St. John's Methodist Episcopal Church | Davenport | Building | 1983 |
| St. Joseph's Catholic Church | Davenport | Building | 1983 |
| St. Katherine's Historic District | Davenport | District | 1984 |
| St. Luke's Hospital | Davenport | Building | 1983 |
| St. Mary's Academy | Davenport | Building | 1984 |
| St. Mary's Roman Catholic Church Complex | Davenport | Building | 1984 |
| St. Paul's English Lutheran Church | Davenport | Building | 1983 |
| Stewart, J. W., House | Davenport | Building | 1983 |
| Stone House | Le Claire | Building | 1983 |
| Stone School | Le Claire | Building | 1977 |
| Struck, Dr. Kuno, House | Davenport | Building | 1984 |
| Suiter, Jacob, House | Le Claire | Building | 1979 |
| Suiter, John H., House | Le Claire | Building | 1979 |
| Suiter, William, House | Le Claire | Building | 1979 |
| Swan, George B., House | Davenport | Building | 1983 |
| Swedish Baptist Church | Davenport | Building | 1983 |
| Taylor School | Davenport | Building | 1983 |
| Templeton, I. Edward, House | Davenport | Building | 1983 |
| Tevoet, Lambert, House | Davenport | Building | 1983 |
| Trinity Episcopal Cathedral | Davenport | Building | 1974 |
| Tromley, George, Jr., House | Le Claire | Building | 1979 |
| Tromley, George, Sr., House | Le Claire | Building | 1979 |
| Union Electric Telephone & Telegraph | Davenport | Building | 1983 |
| Union Savings Bank and Trust | Davenport | Building | 1983 |
| Union Station and Burlington Freight House | Davenport | Building | 1983 |
| United States Post Office and Court House | Davenport | Building | 2005 |
| Untiedt, Claus, House | Davenport | Building | 1984 |
| Van Sant, Samuel, House | Le Claire | Building | 1979 |
| Vander Veer Park Historic District | Davenport | District | 1985 |
| Von Ach, Frank J., House | Davenport | Building | 1984 |
| WOC Broadcasting Center | Davenport | Building | 2021 |
| Walsh Flats/Langworth Building | Davenport | Building | 1984 |
| Walter-Gimble House | Davenport | Building | 1983 |
| Warner Apartment Building | Davenport | Building | 1983 |
| Washington Flats | Davenport | Building | 1984 |
| Washington Gardens | Davenport | Building | 1984 |
| Werthman Grocery | Davenport | Building | 1984 |
| West Third Street Historic District | Davenport | District | 1983 |
| Westphal-Schmidt House | Davenport | Building | 1984 |
| Whitaker, Charles, House | Davenport | Building | 1985 |
| Wilkinson, Thomas C., House | Davenport | Building | 1984 |
| Wolters Filling Station | Davenport | Building | 1984 |
| Woods, Oscar C., House | Davenport | Building | 1984 |
| Worley, Philip, House | Davenport | Building | 1983 |
| Wupperman Block/I.O.O.F. Hall | Davenport | Building | 1983 |
| Zoeller Bros-Independent Malting Co. | Davenport | Building | 1983 |