Category:NRHP list missing refnum

The pages in this category are lists that include U.S. National Register of Historic Places (NRHP) listings using NRHP row where the county variable is set, but the refnum is missing. See WikiProject National Register of Historic Places/Reference numbers on how to help clean this category.

Notes:
 * Do not include this category manually in articles; the NRHP row template automatically does this.