National Register of Historic Places listings in Canyon County, Idaho  This is a list of the National Register of Historic Places listings in Canyon County, Idaho. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Canyon County, Idaho, United States. Latitude and longitude coordinates are provided for many National Register properties and districts; these locations may be seen together in a Google map. There are 47 properties and districts listed on the National Register in the county. More may be added; properties and districts nationwide are added to the Register weekly.