All - Architectural style - Romanesque Revival architecture
| Hobbs Building |
| Holland Library |
| Holy Ghost Catholic Historic District |
| Holy Hill |
| Holy Trinity Armenian Apostolic Church |
| Holy Trinity Catholic Church |
| Holy Trinity Roman Catholic Church |
| Holy Trinity Roman Catholic Church Complex |
| Homestead Building |
| Hopkins County Courthouse |
| Horticulture and Agricultural Physics and Soil Science Building |
| Hotel Lindo |
| Hotel Roodhouse |
| Hotel Sterling |
| Hotel Stilwell |
| Houston Fire Station No. 3 |
| Houston Fire Station No. 7 |
| Howe Building |
| Hubbard Cooke Block |
| Huerfano County Courthouse and Jail |
| Hull Building |
| Hunt-Sitterding House |
| Hyde School |
| Illies Building-Justine Apartments |
| Immaculate Conception Catholic Church Complex |
| Immaculate Heart of Mary Catholic Church |
| Immanuel Methodist Episcopal Church |
| In and Out Social Club |
| Independent Order of Odd Fellows Hall |
| Independent Order of Odd Fellows Temple |
| Inez Hotel |
| Intermediate Building |
| I.O.O.F. Building |
| IOOF Temple Building |
| Iowa County Courthouse |
| Iron County Courthouse |
| Ironwood City Hall |
| Jamestown Opera House |
| Jasper County Courthouse |
| Jefferson Apartment Building |
| Jefferson County Courthouse |
| Jefferson County Courthouse |
| Jefferson County Courthouse |
| Jefferson Standard Building |
| Jerome First Baptist Church |
| Jersey County Courthouse |
| Johnson County Courthouse |
| Johnson County Courthouse |
| Johnson School |
| Johnson Steel Street Railway Company General Offices Building |
| Johnson, Wilbur T. and Rhoda Stephens, House |
| Jones County Courthouse |
| Jones Warehouses |
| Joshua Bates School |
| Judson Building |
| Kamman, Building, The |
| Karnes County Courthouse |
| KEAS Tabernacle Christian Methodist Episcopal Church |
| Keating, Jeffery and Mary, House |
| Keefe Row |
| Kellogg, Frank B., House |
| Kendall County Courthouse and Jail |
| Kennard House |
| Kenwood Evangelical Church |
| Keokuk Union Depot |
| Keplinger, Harry A., House |
| Kingman County Courthouse |
| Kings Highway Christian Church |
| Kingswood Methodist Episcopal Church |
| Kittredge Building |
| Knight-Allen House |
| Kokomo City Building |
| Kuehn Blacksmith Shop-Hardware Store |
| Kuhns, Benjamin F., Building |
| Laconia Passenger Station |
| La Crosse Armory |
| Lafayette Avenue Presbyterian Church |
| Lake County Courthouse |
| Lake Erie and Western Depot Historic District |
| Lake Shore and Michigan Southern (LS&MS) Railroad Depot-Wauseon |
| Lake Shore & Michigan Southern Railroad Station |
| Lambert Building |
| Lamoille County Courthouse |
| Lancaster Block |
| Lancaster Block |
| Lancaster County Courthouse |
| Las Vegas Railroad and Power Company Building |
| Lavaca County Courthouse |
| Lawrence County Bank Building |
| Lawrence County Courthouse |
| Lawrence Library |
| Lawrence Light Guard Armory |
| Lea Block |
| Leadenhall Street Baptist Church |
| L'Ecole Saintes-Anges |
| Lee County Courthouse |
| Lee, Robert E., Hotel |
| Lenawee County Courthouse |
| Le Sueur County Courthouse and Jail |
| Level Club |
Data from United States Park Service and Wikidata
