Last Updated on 22 September 2023
| July | Events |
| 1 | 1902 – Chickasaw National Recreation Area, OK created 1980 – Vietnam Veterans Memorial, DC created |
| 2 | |
| 3 | 1926 – Petersburg National Military Park, VA created |
| 4 | 1976 – Valley Forge National Historical Park, PA created |
| 5 | |
| 6 | 1911 – Devils Postpile National Monument, CA created 1960 – Arkansas Post National Memorial, AR created |
| 7 | |
| 8 | 1916 – Acadia National Park, ME created |
| 9 | 1952 – Coronado National Memorial, AZ created |
| 10 | 2015 – Waco Mammoth National Monument, TX created |
| 11 | |
| 12 | 1909 – Oregon Caves National Monument, OR created |
| 13 | |
| 14 | 1943 – George Washington Carver National Monument, MO created |
| 15 | |
| 16 | 1790 – National Mall, DC created 1938 – Fort Laramie National Historic Site, WY created |
| 17 | 1916 – Abraham Lincoln Birthplace National Historical Park, KY created |
| 18 | |
| 19 | |
| 20 | 1956 – Pea Ridge National Military Park, AR created |
| 21 | |
| 22 | |
| 23 | 1966 – George Rogers Clark National Historical Park, IN created |
| 24 | |
| 25 | 1939 – Tuzigoot National Monument, AZ created 1956 – Horseshoe Bend National Military Park, AL created 1962 – Sagamore Hill National Historic Site, NY created 1962 – Theodore Roosevelt Birthplace National Historic Site, NY created |
| 26 | 1955 – Puʻuhonua o Hōnaunau National Historical Park, HI created |
| 27 | |
| 28 | |
| 29 | |
| 30 | 1965 – Golden Spike National Historic Site, UT created |
| 31 | 1909 – Zion National Park, UT created |
