There are five primary "streams" of NRHP-related entities that we actively seek to include in Wikidata:

Individual NRHP listings edit

General considerations edit

As a general rule, there should be exactly one item for each NRHP reference number. Some exceptions are discussed below, where a single item may have more than one refnum attached. There should almost never be one refnum that appears on more than one item.

Label, description, alias edit

The Wikidata label does not need to be identical or even similar to the entity's NRHP listing name. Where there is a significant difference between the label and the NRHP name, enter the NRHP name as an alias. In cases where the label has both a personal first and personal last name, enter an alias with just the last name: e.g. label of "John Smith House" and alias of "Smith House". While any appropriate description may be used, a large portion of NRHP items can use the format: "historic thing in city, state, USA", e.g. "historic house in Burlington, Iowa, USA". Every NRHP item should have a label/description in English; other languages may also be desirable.

Core statements edit

All of these statements must be present on the NRHP item, otherwise constraint violation errors will be triggered.

  • instance of (P31): The scope of this statement will in general correspond to that of the "historic function" in nomination forms and NRHP databases. Copying the "historic function" (or nearest Wikidata analogue) across from the nomination form can be a good starting point for populating this statement. (Remember to cite the nomination form as a reference: see #Items for nomination forms below. Note NPGallery does not include fields for function.) Multiple (non-redundant) values may be used. Selection of the ideal value(s) for this property can be a nuanced decision. This is true for most items and not just National Register items, but here are some considerations that come up frequently in the NRHP context:
Valid values: For NRHP items, at least one value of instance of (P31) must be a physical or geographic object: i.e. a subclass of geographical feature (Q618123) or artificial physical object (Q8205328). If you see a constraint violation related to this issue (the violation notice will appear next to NRHP reference number (P649)), it likely means you have selected a value that is similar to but subtly different from a valid value (see also "Building vs. organization" below). For example:
not valid valid
battle (Q178561) battlefield (Q4895508)
parish church (Q317557) church building (Q16970)
fabricator (Q42855995) factory (Q83405)
Note, however, that in some cases the correct response to a constraint violation is not to change the statement on the NRHP item, but instead to ensure that the statement's value is a properly subclass of geographic/physical objects. Also note that as long as one valid value is present, other values are not required to meet the "validity" requirement. For example, a single item may cover both a significant parish church (Q317557) as well as the historic church building (Q16970) that it occupies.
Historic use vs. current use: Although the function performed by a historic resource may change with time, the NRHP's evaluation of "historic integrity" generally ensures that the property retains its essential character from the historic period, at least as of the date of listing. Values of instance of (P31) should therefore reflect the historic character, the foundational identity of the property; subsequent adaptations are best captured by has use (P366) statements (see also below). Thus a church that is no longer used for religious purposes but has been converted to a performance space might have the following statements:
instance of (P31) church building (Q16970)
has use (P366) concert hall (Q1060829)
Similarly, an NRHP-listed house that has been converted to a museum would never be an instance of (P31)house museum (Q2087181). Instead, it would likely have:
instance of (P31) house (Q3947)
has use (P366) house museum (Q2087181)
For context, one might use instance of (P31)house museum (Q2087181) if the focus of the Wikidata item was on the museum as an institution rather than on the building. However NRHP items always focus on the physical building.
Partial exception to historic function: Two values may be used in an instance of (P31) statement that do not represent the listed property's historic function: historic district (Q15243209) and archaeological site (Q839954). In NRHP items, however, those values should always be paired with one or more additional statements that represent a historic function. For example, historic district (Q15243209) may be paired with neighborhood (Q123705), downtown (Q1050303), commercial district (Q1133961), industrial district (Q1662024), or town (Q3957), among other possibilities. For its part, archaeological site (Q839954) might be paired with village (Q532), shelter (Q7493941), tumulus (Q34023), campsite (Q832778), battlefield (Q4895508), shipwreck (Q852190), or others..
Optimal level of specificity: Wikidata is organized in a system of P31 instances and P279 subclasses. Every value of instance of (P31) will be a subclass of a broader concept, and may also have more specific subclasses below it. In general, the chosen value of the instance of (P31) statement should be located at the lowest possible level in the subclass tree, but without redundantly embracing concepts encompassed by other statements. Therefore, we will always use house (Q3947) in preference to historic house (Q5773747) (redundant with the heritage designation (P1435) statement) or house museum (Q2087181) (redundant with the has use (P366) statement). We will always use historic district (Q15243209) in preference to historic district in the United States (Q1620797) (redundant with the country (P17) statement). Other cases may require more editor discretion: is it preferable in a particular case to use limestone quarry (Q2940297), or quarry (Q188040) with a product or material produced or service provided (P1056):limestone (Q23757) statement? Note that in the intersection of NRHP items with other areas of interest, reasons beyond the NRHP area may call for modified approaches.
Building vs. organization: Be aware of the distinction between a building designed for a particular purpose, and the establishment or organization that occupies that building. Some examples:
organization building
school (Q3914) school building (Q1244442)
museum (Q33506) museum building (Q24699794)
bank (Q22687) bank building (Q18761864)
hotel (Q27686) hotel building (Q63099748)
library (Q7075) library building (Q856584)
hospital (Q16917) hospital building (Q39364723)
spa (Q1341387) spa building (Q61708634)
etc. etc.
The NRHP is about places rather than organizations/institutions. In many cases, a single item may provide coverage of both the building and the organization that occupies it, especially if the original occupant is still the current occupant: generally values in the "organization" column will cover both building and occupant in these cases. In other cases, especially when the original occupant is no longer present, it is preferable to separate the occupying organization(s) (if notable) and the building into separate items. In these cases, use a value from the "building" column for the NRHP item. To cross-reference the organization and the building items to each other, use location (P276) and occupant (P466) statements with appropriate date qualifiers (start time (P580) and end time (P582)).
historic district (Q15243209) vs. NRHP district (Q20856087): Never use NRHP district (Q20856087) as part of an instance of (P31) statement. (The same applies to NRHP building (Q47162123), NRHP structure (Q47162146), NRHP site (Q47162186), and NRHP object (Q47162172).) It is reserved as a qualifier for heritage designation (P1435):National Register of Historic Places listed place (Q19558910). When using instance of (P31):historic district (Q15243209), bear in mind that Wikidata's generic "historic district" is not directly equivalent to the National Register's "district" classification. The English description for Q15243209 reads: "section of a city which contains older buildings considered valuable for historical or architectural reasons", implying an urban context and multiple properties with different ownership. A historic ranch complex that is classified as an NRHP district (Q20856087), for instance, will be found in a rural area and usually under single ownership.
  • country (P17): Value will almost always be United States of America (Q30) for NRHP-listed entities. Barring a change in NRHP law or practice, the only exceptions are Federated States of Micronesia (Q702), Marshall Islands (Q709), Palau (Q695), and Morocco (Q1028). However, Puerto Rico (Q1183) may be used in addition to United States of America (Q30) where there is a desire/need to express a distinct Puerto Rican character of the entity, usually after discussion with a contributor advocating for such an expression. Also see "Special cases" below regarding other additional values.
  • located in the administrative territorial entity (P131): Always state the county or county equivalent where the NRHP listing is located. If the listed boundaries extend into more than one county (including across state lines), state all of the counties/equivalents where a part of the listing is found. If it is appropriate to state lower-level administrative divisions (cities, villages, towns, townships, boroughs, etc.), state them in addition to the county/equivalent. (This is in contrast to the standard instructions with P131 which advise stating only the lowest-level administrative territorial entity. However, stating the city, for example, is often insufficient to determine which county hosts the listed property.)
  • coordinate location (P625): All coordinates in Wikidata should be in the WGS84 datum: the coordinate system used by all modern GPS apps and most online mapping sites (e.g. Google Maps), but not NRIS nor most NRHP nomination forms. Enter the latitude and longitude you have even if you are unable to verify they are correct WGS84 coordinates. If you are able to do so, check the coordinates against an online mapping site and adjust as necessary. Always enter one set of coordinates that best describes the entire NRHP listing, generally without qualification. You may enter additional sets qualified with applies to part (P518). For example, if a listing is a linear resource, you might enter one set of coordinates for the midpoint (set to preferred rank), but then two additional sets for the termini qualified with e.g. applies to part (P518)end (Q12769393) and direction (P560)east (Q684).
  • heritage designation (P1435): For individual NRHP listings use value National Register of Historic Places listed place (Q19558910). The following qualifiers are also required.
  • start time (P580): Enter the listing date as provided by NPGallery or the Weekly List.
  • subject named as (P1810): Enter the name copied and pasted from (1) NPGallery, (2) the Weekly List, or (3) the nomination form, in that order of preference. Save without correction or reformatting, including reformatting to enwiki style standards.
  • subject has role (P2868): Use one of five values: NRHP building (Q47162123), NRHP structure (Q47162146), NRHP site (Q47162186), NRHP object (Q47162172), or NRHP district (Q20856087). Corresponds directly to the "Resource Type" field in NPGallery. If an NPGallery page is unavailable, or the value given in NPGallery appears to be a data entry error, the NRHP nomination form may be used as a backup source.
  • criterion used (P1013): Use one or more of four values: A (Q47035155), B (Q47035235), C (Q47035253), and D (Q47035331). Corresponds directly to the "Applicable Criteria" field in NPGallery (where "EVENT"=A, "PERSON"=B, "ARCHITECTURE/ENGINEERING"=C, and "INFORMATION POTENTIAL"=D). If an NPGallery page is unavailable, or the value given in NPGallery appears to be a data entry error, the NRHP nomination form may be used as a backup source.
  • part of (P361): When used as a qualifier to statement heritage designation (P1435)National Register of Historic Places listed place (Q19558910), P361 refers to the multiple listing (MRA, TR, MPS) that the subject listing is part of. The value is the Wikidata item for the multiple listing: create the item if necessary (see below). Corresponds to the "Multiple Listing" field in NPGallery, if the field is present. If an NPGallery page is unavailable, the Weekly List is the preferred backup source; if neither NPGallery nor Weekly List is available, the NRHP nomination form may be used. If no multiple listing is stated in the source, then set the qualifier to no value in order to make a positive statement that the individual listing is not associated with a multiple listing.
  • NRHP reference number (P649): Self-explanatory. If there is any question about the correct refnum to use, use the one in NPGallery or other NPS databases in preference to one given in the Weekly List, state databases, or other sources. A few sentences on the discussion page are appropriate in the case of ambiguity.

Optional statements edit

Important secondary statements
  • inception (P571): Useful as an indication of the age of the NRHP-listed resource, for buildings and structures this will generally be the date of construction. For historic districts the inception will generally be the beginning of development of the neighborhood, but in some cases may be the construction date of the oldest resource in the district. For archaeological sites, it will be the age of the oldest archaeological resources in the site and may be quite ancient. Inception will never be the date of listing on the NRHP.
  • image (P18): The image used will most likely be the image on the enwiki NRHP list or NRHP infobox, but does not have to be if other images are available.
  • Commons category (P373): This statement should always be used if the NRHP entity has a Commons category, even if it is redundant to a Commons sitelink.

Timeline statements

Significance/description statements

Note that the use of area (P2046) as a qualifier does not exclude using the same property also in a primary statement with a different value. The qualifier should report precisely that area included in the NRHP listing; by contrast the primary statement might reflect an area more intuitively associated with the subject (size of the lot a house sits on for the qualifier vs. interior square footage of the house for the primary statement) or the area of a subject only part of which was included in the NRHP (for example Laurelhurst Park (Q6500074)). Simple math by the contributor is allowable; for example if the source states "50 feet by 20 feet" then enter an area of "1000 square feet".

Location statements

Relational statements

References edit

Special cases edit

  • Boundary increases/decreases: Possible example: Old Spanish Trail – Mormon Road Historic District (Q47087300)
  • Delisted
  • Delisted and relisted
  • Address restricted
  • National Historic Landmarks
  • Shipwrecks and other submarine resources
  • Ships ad other resources of foreign origin
  • Conflicting listing dates: In the unusual but not-unheard-of event of a conflict between NPGallery and the Weekly List with regard to listing date, and a copy of the nomination form showing the Keeper's signature is available, then the date of the Keeper's signature is the tiebreaker. Otherwise, use best discretion to discern which is the better date to use. Careful citations and perhaps a sentence or two on the talk page are advisable in the case of a conflict. Also, a second heritage designation (P1435) statement with the rejected date, deprecated rank, source, and a reason for deprecated rank (P2241) qualifier may be appropriate.

  • The English label should generally, but with a fair number of exceptions, be the official NRHP name of the listing but with the stylistic modifications used on enwiki for county lists/infoboxes/article titles. Some of the blanket exceptions include:
    • Wikidata does not support italic type in labels, so italics must be omitted from ship names. Still use title case, not all caps.
    • In some cases, the enwiki-style name is more appropriate to another language's label (especially Spanish), while Wikidata standards require a translation (i.e. departing from the NRHP name) for the English label. (For example: Old Spanish military hospital in Ponce (Q4774854). The official NRHP name used on enwiki is "Antiguo Hospital Militar Español de Ponce", while Wikidata standards suggest that should be the Spanish label while the English label is translated, as seen.)
    • Where the enwiki-style name uses a dash, include the dash in the item label, but be sure to incude an alias that replaces the dash with a hyphen.
  • criteria
  • property type
  • MPS
  • contributing status

Items for contributing resources edit

Items for noncontributing resources edit

Items for MPDs edit