Oklahoma - Area of significance: Architecture
| Griffin House |
| Grisso, W. E., Mansion |
| Guthrie Armory |
| Guthrie Historic District |
| Hadley House |
| Hadley, Walter, House |
| Hales, W. T., House |
| Hanes Home |
| Harbour-Longmire Building |
| Harding Junior High School |
| Hargis-Mitchell-Cochran House |
| Harmon Athletic Field |
| Harmon County Courthouse |
| Harmony School |
| Harper County Courthouse |
| Harrison School |
| Harwelden |
| Haskell County Courthouse |
| Hatashita, Henry C., House |
| Hayes-Kennedy-Rivoli Theater Building |
| Healdton Armory |
| Healdton Oil Field Bunk House |
| Hedlund Motor Company Building |
| Henry, Hugh, House |
| Heritage Hills Historic and Architectural District |
| Hightower Building |
| Hines Round Barn |
| Historic Downtown Sulphur Commercial District |
| Hobart Rock Island Depot |
| Hogue House |
| Holdenville Armory |
| Holy City of the Wichitas Historic District |
| Holy Family Cathedral, Rectory, and School |
| Hominy Armory |
| Hominy Osage Round House |
| Hooker Woodframe Grain Elevator |
| Hooper Brothers Coffee Company Building |
| Hopewell Baptist Church |
| Hotel Aldridge |
| Hotel Cherokee |
| Hotel Franklin |
| Hotel Vinita |
| Hough Woodframe Elevator |
| House at 1554 SW Rogers |
| House Building |
| Hubbard, William and Mabel Donahoo, House |
| Hughes, George, House |
| Hugo Armory |
| Hugo Public Library |
| Humphreys Drugstore Building |
| Huston Elementary School |
| Idabel Armory |
| Immaculate Conception Church |
| India Temple Shrine Building |
| Ingersoll Tile Elevator |
| Ingram House |
| International Temple, Supreme Assembly, Order of the Rainbow for Girls |
| I.O.O.F. Building of Buffalo |
| I.O.O.F. Hall |
| Iroquois Apartments |
| Irving Baptist Church |
| Jackson Conoco Service Station |
| Jackson County Courthouse |
| Jackson School |
| Jacobson, Oscar B., House |
| Jefferson County Courthouse |
| Jefferson Park Historic District |
| Johnson Home |
| Johnson House |
| Jones, Robert Lawton, House |
| Joyce House |
| Jurhee Apartments |
| Kaufman, H. L., House |
| Kavanaugh and Shea Building |
| Kaw City Depot |
| Kay County Courthouse |
| Kendall Place Historic District |
| Kennedy Mansion |
| Kenwood Historic District |
| Kerfoot House |
| Kiel-Dover Farmers Elevator |
| Kimmell Barn |
| Kingfisher Armory |
| Kingman-Moore Building |
| Kinta High School |
| Kiowa County Courthouse |
| Kisner, Robert R. and Minnie L., House |
| Kivlehen House |
| Knowles Grain Elevator |
| Konawa Armory |
| Lake Murray State Park |
| Lake Okmulgee Dam Spillway Cascade |
| Lake Ponca Duck Pond Historic District |
| Lamerton House |
| Laney, J. D., House |
| Langston Jail |
| Langston University Cottage Row Historic District |
| La Quinta |
| Larkin Hotel |
| Laverne's North Main Street District |
Data from United States Park Service and Wikidata
