| Name and location | Total acreage |
| Abraham Lincoln Birthplace (Ky.) | 344.50 |
| Allegheny Portage Railroad (Pa.) | 1,249.20 |
| Andersonville (Ga.) | 494.61 |
| Andrew Johnson (Tenn.) | 16.68 |
| Bent's Old Fort (Colo.) | 798.80 |
| Boston African-American (Mass.) | 0.59 |
| Brown v. Board of Education (Kans.) | 1.85 |
| Carl Sandburg Home (N.C.) | 263.65 |
| Charles Pinckney (S.C.) | 28.45 |
| Chimney Rock (Nebr.) | 83.36 |
| Christiansted (U.S. V.I.) | 27.15 |
| Clara Barton (Md.) | 8.59 |
| Edgar Allan Poe (Pa.) | 0.52 |
| Edison (N.J.) | 21.25 |
| Eisenhower (Pa.) | 690.46 |
| Eleanor Roosevelt (N.Y.) | 180.50 |
| Eugene O'Neill (Calif.) | 13.19 |
| First Ladies (Ohio) | 0.33 |
| Ford's Theatre (Lincoln Museum) (DC) | 0.29 |
| Fort Bowie (Ariz.) | 999.45 |
| Fort Davis (Tex.) | 473.87 |
| Fort Laramie (Wyo.) | 832.85 |
| Fort Larned (Kan.) | 718.39 |
| Fort Point (Calif.) | 29.00 |
| Fort Raleigh (N.C.) | 512.93 |
| Fort Scott (Kan.) | 16.69 |
| Fort Smith (Ark.-Okla.) | 75.05 |
| Fort Union Trading Post (N.D.-Mont.) | 443.81 |
| Fort Vancouver (Wash.) | 208.89 |
| Frederick Douglass (DC) | 8.53 |
| Frederick Law Olmsted (Mass.) | 7.21 |
| Friendship Hill (Pa.) | 674.56 |
| Gloria Dei Church (Pa.) | 3.71 |
| Golden Spike (Utah) | 2,735.28 |
| Grant-Kohrs Ranch (Mont.) | 1,618.38 |
| Hampton (Md.) | 62.04 |
| Harry S. Truman (Mo.) | 6.67 |
| Herbert Hoover (Iowa) | 186.80 |
| Home of F. D. Roosevelt (N.Y.) | 799.98 |
| Hopewell Furnace (Pa.) | 848.06 |
| Hubbell Trading Post (Ariz.) | 160.09 |
| James A. Garfield (Ohio) | 7.82 |
| Jamestown (Va.) | 22.5 |
| Jimmy Carter (Ga.) | 70.86 |
| John F. Kennedy (Mass.) | 0.09 |
| John Muir (Calif.) | 344.73 |
| Knife River Indian Villages (N.D.) | 1,758.35 |
| Lincoln Home (Ill.) | 12.24 |
| Little Rock Central High School (Ark.) | 27.28 |
| Longfellow (Mass.) | 1.98 |
| Lower East Side Tenement Museum (N.Y.) | n.a. |
| Maggie L. Walker (Va.) | 1.29 |
| Manzanar (Calif.) | 813.81 |
| Martin Luther King, Jr. (Ga.) | 38.66 |
| Martin Van Buren (N.Y.) | 39.55 |
| Mary McLeod Bethune Council House (DC) | 0.07 |
| Minuteman Missile (S.D.) | 15.00 |
| Nicodemus (Kans.) | 161.35 |
| Ninety Six (S.C.) | 989.14 |
| Palo Alto Battlefield (Tex.) | 3,407.46 |
| Pennsylvania Avenue (DC) | 0.00 |
| Puukohola Heiau (Hawaii) | 86.24 |
| Ronald Reagan Boyhood Home (Ill.) | 1.01 |
| Sagamore Hill (N.Y.) | 83.02 |
| Saint-Gaudens (N.H.) | 148.15 |
| Saint Paul's Church (N.Y.) | 6.13 |
| Salem Maritime (Mass.) | 9.02 |
| Sand Creek Massacre (Colo.) | 12,583.34 |
| San Juan (P.R.) | 75.13 |
| Saugus Iron Works (Mass.) | 8.51 |
| Sewall-Belmont House (DC) | 0.35 |
| Springfield Armory (Mass.) | 54.93 |
| Steamtown (Pa.) | 62.48 |
| Theodore Roosevelt Birthplace (N.Y.) | 0.11 |
| Theodore Roosevelt Inaugural (N.Y.) | 1.03 |
| Thomas Stone (Md.) | 328.25 |
| Touro Synagogue (R.I.) | 0.23 |
| Tuskegee Airmen (Ala.) | 86.69 |
| Tuskegee Institute (Ala.) | 57.92 |
| Ulysses S. Grant (Mo.) | 9.60 |
| Vanderbilt Mansion (N.Y.) | 211.65 |
| Washita Battlefield (Okla.) | 315.20 |
| Weir Farm (Conn.) | 74.20 |
| Whitman Mission (Wash.) | 99.93 |
| William Howard Taft (Ohio) | 3.10 |
Atlas
Encyclopedia
Dictionary
Thesaurus
Day in History
