Iowa - Architectural style - Colonial Revival architecture
| Adler, E. P., House |
| Alumni Hall |
| Ausadie Building |
| Baker, C. H., Double House |
| Berry, Dr. William E. and Ethel Rosenberger, House |
| Bethel African Methodist Episcopal Church |
| Buchanan School |
| Burkam, Elzy G., House |
| Carpenter, James Sansom, House |
| Cavin, Thomas E., House |
| City Hall |
| Colonials Club House |
| Conover, Thomas J., House |
| Damour, William and Sue, House |
| Douglas, George B., House |
| Ebeling, Arthur, House |
| Epworth School |
| Farwell, S. S., House |
| French, Alice, House |
| Garland House |
| Grilk, Charles, House |
| Haley, F.E., Double House |
| Hallett Flat-Rawson & Co. Apartment Building |
| Hanson, Alfred, House |
| Herman, John H., House |
| Holdoegel, Perry C. and Mattie Forrest, House |
| Hotel Russell-Lamson |
| Iowan's Hotel |
| Iowa Yearly Meeting House-College Avenue Friends Church |
| Klose, Dr. William H. and Mae R., House |
| Knott, Dr. Van Buren, House |
| Le Mars Central High School |
| Lincoln School |
| Loetscher, T. Ben, House |
| Lord, Richard T. C., and William V. Wilcox House |
| Louden, R. Bruce and May W., House |
| Louden, R.R., and Antoinette, House |
| Mason City YMCA |
| McClung, J. J., House |
| Memorial Building |
| Methodist Deaconess Institute-Esther Hall |
| Ockershausen, Henry, House |
| Outing Club |
| Peak, George B., House |
| Perkins, George and Lola, House |
| Perry Carnegie Library Building |
| Pierson-Betts House |
| Pyle, Glenn O. and Lucy O., House |
| Renwick House |
| Savery Hotel |
| Shellito, Dr. Judd C. and Margaret S. Clarke, House |
| Sigourney Public Library |
| Singmaster, C.F. and Mary, House |
| Smith, William G., House |
| St. Mary's Catholic Church Historic District |
| Sturdivant-Sawyer House |
| Taylor School |
| Union Station and Burlington Freight House |
| Von Ach, Frank J., House |
| Weis, Henry, House |
| Weitz, Charles H. and Lena May, House |
| Wheeler, John R., Jr., House |
| Whitehead, C. H., House |
| White, W. T. S., House and Carriage House |
| Wieting Theater |
| Y.M.C.A. Building |
Data from United States Park Service and Wikidata
