National Register of Historic Places property types
Listed properties generally fall into one of five categories, though there are special considerations for other types of properties which do not fit into these five broad categories or fit into more specialized subcategories. The five general categories for NRHP properties are: building, structure, object, site, and district.
 I When multiple like properties are submitted as a group and listed together, they are known as a
Buildings, as defined by the National Register, are structures intended to shelter some sort of human activity. Examples include a
Buildings included on the National Register of Historic Places must have all of their basic structural elements as parts of buildings, such as
The National Register of Historic Places defines a historic district per U.S. federal law, last revised in 2004.  According to the Register definition, a historic district is: "a geographically definable area, urban or rural, possessing a significant concentration, linkage, or continuity of sites, buildings, structures, or objects united by past events or aesthetically by plan or physical development. In addition, historic districts consist of contributing and non-contributing properties. Historic districts possess a concentration, linkage or continuity of the other four types of properties. Objects, structures, buildings and sites within a historic district are usually thematically linked by architectural style or designer, date of development, distinctive urban plan, and/or historic associations."  For example, the largest collection of houses from 17th and 18th century America are found in the McIntire Historic District in Salem, Massachusetts. 
Objects are usually artistic in nature, or small in scale when compared to structures and buildings. Though objects may be movable, they are generally associated with a specific setting or environment. Examples of objects include
Objects considered for inclusion on the NRHP, whether individually or as part of districts, should be designed for a specific location; objects such as transportable sculpture,
Sites may include discrete areas significant solely for activities in that location in the past, such as battlefields, significant archaeological finds, designed landscapes (parks and gardens), and other locations whose significance is not related to a building or structure.
Sites often possess significance for their potential to yield information in the future, though they are added to the Register under all four of the criteria for inclusion. A sites need not have actual physical remains if it marks the location of a
Structures differ from buildings, in that they are functional constructions meant to be used for purposes other than sheltering human activity. Examples include, an
The criteria of significance are applied to nominated structures in much the same fashion as they are for buildings. The basic structural elements must all be intact; no individual parts of the structure are eligible for separate inclusion on the NRHP. An example would be a