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.
A census-designated place (CDP) is a concentration of population defined by the United States Census Bureau for statistical purposes only.
There are more than 1,500 properties and districts listed on the National Register of Historic Places in the U.S. State of Maryland. Each of the state's 23 counties and its one county-equivalent has at least 20 listings on the National Register.
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 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, 44 are National Historic Landmarks. Each of Indiana's 92 counties has at least two listings.
There are over 1,600 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 459 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.