Placer County, officially the County of Placer, is a county located in the U.S. state of California. As of the 2020 census, the population was 404,739. The county seat is Auburn.
An unincorporated area is a region that is not governed by a local municipal corporation. There are many unincorporated communities and areas in the United States and Canada. Most other countries have very few or no unincorporated areas.
A census-designated place (CDP) is a concentration of population defined by the United States Census Bureau for statistical purposes only.
This is a list of properties and historic districts in Oklahoma that are designated on the National Register of Historic Places. Listings are distributed across all of Oklahoma's 77 counties.
This is a list of properties and historic districts in Iowa that are listed on the National Register of Historic Places. There are listings in all of Iowa's 99 counties, adding up to over 2,300 total.
This is a list of properties and historic districts in Montana that are listed on the National Register of Historic Places. The state's more than 1,100 listings are distributed across all of its 56 counties.
Buildings, sites, districts, and objects in Delaware listed on the National Register of Historic Places:
There are more than 1,800 properties and districts listed on the National Register of Historic Places in Florida. They are distributed through 66 of the state's 67 counties. Of these, 42 are National Historic Landmarks.
This National Park Service list is complete through NPS recent listings posted December 1, 2023.
This is a list of properties and districts listed on the National Register of Historic Places in Connecticut. There are more than 1,500 listed sites in Connecticut. All 8 counties in Connecticut have listings on the National Register.
This is a list of properties and districts in Indiana that are listed on the National Register of Historic Places. There are over 2,000 in total. Of these, 39 are National Historic Landmarks. Each of Indiana's 92 counties has at least two listings.
There are over 1,400 buildings, sites, districts, and objects in Kansas listed on the National Register of Historic Places in Kansas. NRHP listings appear in 101 of the state's 105 counties.
This is a list of properties and districts in New Mexico that are on the National Register of Historic Places. There are more than 1,100 listings. Of these, 46 are National Historic Landmarks. There are listings in each of the state's 33 counties.
This is a list of properties and historic districts in Nevada that are listed on the National Register of Historic Places. There is at least one listing in each of Nevada's 16 counties and one independent city.
There are 461 properties and historic districts listed on the National Register of Historic Places in North Dakota. There are listings in 52 of North Dakota's 53 counties.
This is a list of properties and districts listed on the National Register of Historic Places in Rhode Island. As of May 29, 2015, there are more than 750 listed sites in Rhode Island. All 5 of the counties in Rhode Island have listings on the National Register.
There are 577 properties and districts listed on the National Register of Historic Places in New York County, New York, which consists of Manhattan Island, the Marble Hill neighborhood on the mainland north of the Harlem River Ship Canal, and adjacent smaller islands around it. One listing, appears on more than one of the lists described below.