Maryland - Area of significance: Architecture
| First Avenue School |
| First Baptist Church |
| First Church of Christ, Scientist |
| First Presbyterian Church and Manse |
| First Unitarian Church |
| Fletcher, K. B., Mill |
| Footer's Dye Works |
| Forest View |
| Fort Frederick State Park |
| Fort Garrison |
| Fort Washington |
| Franklin Square Historic District |
| Franklin Street Presbyterian Church and Parsonage |
| Franklintown Historic District |
| Frank, L., & Son Building |
| Frederick Armory |
| Frederick Historic District |
| Friends Burial Ground |
| Friendship |
| Friendship Hall |
| Friendship United Methodist Church, Old |
| Friendship Valley Farm |
| Frizzell, Andrew P., House and Farm Complex |
| Frostburg Historic District |
| Fuller-Baker Log House |
| Funk, Jacob M., Farm |
| Funkstown Historic District |
| Gaithersburg B & O Railroad Station and Freight Shed |
| Gallagher Mansion and Outbuilding |
| Gambrill House |
| Garden Hill |
| Garrett Building |
| Garrett County Courthouse |
| Garrett Park Historic District |
| Gay Street Historic District |
| Geeting Farm |
| Genesar |
| Gillis-Grier House |
| Gladden Farm |
| Glamorgan |
| Glasgow |
| Glebe House |
| Glencoe |
| Glen Echo Park Historic District |
| Glenelg Manor |
| Glenn L. Martin Company Plant No. 2 |
| Glenview Farm |
| Glyndon Historic District |
| Gobbler Hill |
| Godlington Manor |
| Goldsborough House |
| Gompers School |
| Good-Hartle Farm |
| Good-Reilly House |
| Goucher College |
| Grace Episcopal Church |
| Grace Episcopal Church Complex |
| Grace-Hampden Methodist Episcopal Church |
| Graham-Crocker House |
| Grahame House |
| Grassland |
| Gray Gables |
| Graystone Lodge |
| Greater Homeland Historic District |
| Great House |
| Greenbelt Historic District |
| Greene Street Historic District |
| Greenfields |
| Green Mount Cemetery |
| Green's Inheritance |
| Green Spring Valley Historic District |
| Grey Rock Mansion |
| Griffith House |
| Grossnickel, Peter of P., Farm |
| Guilford |
| Guilford Historic District |
| Gunn, Samuel, House |
| Habre-de-Venture; Thomas Stone National Historic Site |
| Hager House |
| Hagerman, William, Farmstead |
| Hagerstown Armory |
| Hagerstown Charity School |
| Hagerstown City Park Historic District |
| Hagerstown Commercial Core Historic District |
| Hagerstown Historic District |
| Haley, Francis, House |
| Hamilton, James, House |
| Hammond-Harwood House |
| Hammond Wood Historic District |
| Hampden Historic District |
| Hampton National Historic Site |
| Hancock's Resolution |
| Handsell |
| Hanover Farm House |
| Hard Bargain Farm |
| Hard Lodging |
| Harford National Bank |
| Harmony Hall |
| Harper, George, Store |
| Harrington |
Data from United States Park Service and Wikidata
