Oklahoma - Significance region: Local
| Hugo Frisco Railroad Depot |
| Hugo Historic District |
| Hugo Public Library |
| Humphreys Drugstore Building |
| Huston Elementary School |
| Idabel Armory |
| Illinois Campground |
| Immaculate Conception Church |
| Indian Citizen Building |
| India Temple Shrine Building |
| Ingersoll Tile Elevator |
| Ingle Brothers Broomcorn Warehouse |
| Ingram House |
| I.O.O.F. Building of Buffalo |
| I.O.O.F. Hall |
| Iroquois Apartments |
| Irving Baptist Church |
| Irvings Castle |
| Jackson, Barnett, No. 11 Oil Well |
| Jackson Conoco Service Station |
| Jackson County Courthouse |
| Jackson School |
| James Carl, Sr., and Lucille Johnson Family House |
| Jamison Cemetery |
| Jay Buckle Springs |
| Jefferson County Courthouse |
| Jefferson Park Historic District |
| Jenson Tunnel |
| Jewel Theater |
| Jewett Site |
| Johnson Home |
| Johnson Hotel and Boarding House |
| Johnson House |
| Johnson, J. Coody, Building |
| Johnson Lake Shelters |
| Jones, Charles G., Farmstead |
| Joyce House |
| Jurhee Apartments |
| Kaiser's Ice Cream Parlour |
| KATY Railroad Historic District |
| Kaufman, H. L., House |
| Kavanaugh and Shea Building |
| Kay County Courthouse |
| KCS Railway Depot |
| Keel Creek Bridge |
| Kelley Club |
| Kendall Place Historic District |
| Kennedy Mansion |
| Kenwood Historic District |
| Kerfoot House |
| Kiel-Dover Farmers Elevator |
| Kimbrough Temple C.M.E. Church |
| Kimmell Barn |
| Kingfisher Armory |
| Kingfisher College Site |
| Kingfisher Memorial Hall |
| Kingman-Moore Building |
| Kinta High School |
| Kiowa County Courthouse |
| Kisner, Robert R. and Minnie L., House |
| Kivlehen House |
| Klingensmith Park Amphitheater |
| Knippelmier Farmstead |
| Knowles Grain Elevator |
| Konawa Armory |
| Kosyk, Mato, House |
| Lake Okmulgee Dam Spillway Cascade |
| Lake Overholser Bridge |
| Lake Overholser Dam |
| Lake Ponca Duck Pond Historic District |
| Lamerton House |
| Lane Cabin |
| Laney, J. D., House |
| Langston Jail |
| La Quinta |
| Larkin Hotel |
| Lassen, Henry, House |
| Laverne's North Main Street District |
| Lawton High School |
| Ledbetter, H.E., House |
| Lee, Jeff, Park Bath House and Pool |
| Lee, Robert E., School |
| LeFlore County Courthouse |
| Liberty Federal Savings and Loan Association Building |
| Lincoln Colored School |
| Lincoln Park Bathhouse |
| Lincoln Plaza Historic District |
| Lincoln Terrace East Historic District |
| Little Deep Fork Creek Bridge |
| Littlepage Building |
| Loeser, Dr. Irwin D., Log Cabin |
| Logan Apartments |
| Logan County Courthouse |
| Long Branch Creek Bridge |
| L'Ouverture Gymnasium |
| Love County Courthouse |
| Love County Jail and Sheriff's Residence |
| Luster, Melvin F., House |
| Lyons, Sidney and Mary, House and Commercial Historic District |
| Lytton Building-Masonic Hall |
Data from United States Park Service and Wikidata
