National Historic Landmark (United States)

Designation and criteria

Designation as an NHL follows a formal nomination and review process. Typical considerations include a property’s association with events or persons of national importance, architectural distinction, archeological value, or the ability to yield information important to history. A property must also retain sufficient integrity—its location, design, materials, and workmanship—to convey its significance.

• Association with nationally significant events or people
• Architectural or engineering distinction
• Information potential for history or prehistory
• High degree of physical integrity

Historic districts and contributing properties

A National Historic Landmark District (NHLD) is a geographically defined area designated as an NHL that may include multiple contributing properties—individual buildings, structures, sites, or objects—as well as non-contributing elements. The district designation recognizes the collective significance of the ensemble as well as important individual components.

Significance, protections, and limits

Being named an NHL brings national recognition, access to technical guidance, and potential eligibility for preservation incentives, but it does not automatically impose strict private-use restrictions. Protections are strongest when federal involvement is present or when paired with local or state preservation laws. NHLs are a small subset of places listed on the National Register of Historic Places; out of more than 80,000 listed sites, only about 2,430 have NHL status, reflecting their special status and rigorous selection standards. For distinctions between lists and further procedural details, see the federal register and program guidance at the National Register.

Notable facts

NHLs represent a wide range of American history—from political and military sites to landmarks of industry, culture, and science. Their recognition helps focus preservation efforts and public awareness of places that shaped the nation’s development. For more information on categories and examples, consult official program resources administered by the United States government.