Owned by state government

Pin Oak Hollow Bridge (Camden County, Missouri)
Stone arch bridge on CR 134-2 in Lake of the Ozarks State Park
Pine Creek Bridge (Maricopa County, Arizona)
Pine Creek Gristmill (Muscatine County, Iowa)
Pine Creek Potawatomi Reservation (Calhoun County, Michigan)
Pine Mountain State Park (Harris County, Georgia)
Pio Pico Casa (Los Angeles County, California)
Pioneer Log Cabin (Warren County, Kentucky)
Pioneer Memorial State Park (Mercer County, Kentucky)
Pioneer Woman Statue (Kay County, Oklahoma)
Pithole City (Venango County, Pennsylvania)
Former oil town
Pithole Stone Arch Bridge (Venango County, Pennsylvania)
37 foot masonry deck arch bridge
Plainfield Station (Union County, New Jersey)
Planters National Bank (Richmond, Virginia)
Planting Fields Arboretum (Nassau County, New York)
Platte River Crossing (Carbon County, Wyoming)
Playmakers Theatre (Orange County, North Carolina)
Plaza Substation (Los Angeles County, California)
Pleasantville Bridge (Berks County, Pennsylvania)
Covered bridge over Little Manatawny Creek on PA 1030 (Covered Bridge Road)
Plum Bush Creek Bridge (Washington County, Colorado)
Concrete bridge over Plum Bush Creek on US 36
Plum Grove (Johnson County, Iowa)
Plumas-Eureka Mill, Jamison Mines District (Plumas County, California)
Plymouth Rock (Plymouth County, Massachusetts)
Point Isabel Lighthouse (Cameron County, Texas)
Point of Rocks Stage Station (Sweetwater County, Wyoming)
Poison Spring State Park (Ouachita County, Arkansas)
Pokagon State Park (Steuben County, Indiana)
Polk Sisters' House (Maury County, Tennessee)
Pond Mill Bridge (Adams County, Pennsylvania)
Three-span stone arch bridge over Bermudian Creek on PA 1005 (Lattimore Valley Road) in Lake Meade
Pony Express Terminal (Sacramento County, California)
Populo (Miami-Dade County, Florida)
Porcupine District (Haines Borough, Alaska)
Port Arthur--Orange Bridge (Jefferson County, Texas)
Through truss bridge over Neches River on Westbound TX 73 in Port Arthur
Port Orford Coast Guard Station (Curry County, Oregon)
Port Royal Road (Montgomery County, Tennessee)
Porter Hollow Embankment and Culvert (Kent County, Michigan)
Porter Military Academy (Charleston County, South Carolina)
Porter-Parsonfield Bridge (Unspecified county, Maine)
Paddleford through truss bridge over Ossipee River
Portland Bridge (Fremont County, Colorado)
Deck truss over the Arkansas River on CO 120 at Portland
Portsville Lighthouse (Sussex County, Delaware)
Possum Poke (Worth County, Georgia)
Potter Section House (Anchorage, Alaska)
Pottsgrove Mansion (Montgomery County, Pennsylvania)
Pottsville Armory (Schuylkill County, Pennsylvania)
Powder Magazine (Montgomery County, Alabama)
Powder Magazine (East Baton Rouge Parish, Louisiana)
Powerhouse, The (San Luis Obispo County, California)
Powhatan Jail (Lawrence County, Arkansas)
Pownal Cattle Pound (Cumberland County, Maine)
Prairie Grove Battlefield Park (Washington County, Arkansas)
President's Home (Warren County, Kentucky)
President's Home, Northwestern State University (Natchitoches Parish, Louisiana)
President's House (Clarke County, Georgia)
President's House (Maricopa County, Arizona)
President's House (Bernalillo County, New Mexico)
President's House (Hunt County, Texas)
President's House, Bluefield State College (Mercer County, West Virginia)
President's House, University Of Michigan (Washtenaw County, Michigan)
President's House, University of Oklahoma (Cleveland County, Oklahoma)
President's Mansion (Tuscaloosa County, Alabama)
Preston Castle (Amador County, California)
Preston Overlook (Fillmore County, Minnesota)
Preston--Lafreniere Farm (Chittenden County, Vermont)
Price Memorial Hall (Lumpkin County, Georgia)
Prince George's Chapel (Sussex County, Delaware)
Printzhof, The (Delaware County, Pennsylvania)
Prison Brickyard Historic District (Powell County, Montana)
Proctor Maple Research Farm (Chittenden County, Vermont)
Proprietary House (Middlesex County, New Jersey)
Prospect Avenue Subway Station (IRT) (Bronx County, New York)
Prudhoe Bay Oil Field Discovery Well Site (North Slope Borough, Alaska)
Public School Number Two (Passaic County, New Jersey)
Pumphouse Wash Bridge (Coconino County, Arizona)
Purdum Livery Stable (Lincoln County, Idaho)
Purdy Bridge (Pierce County, Washington)
Concrete deck girder bridge over Burley Lagoon on Washington 302
Purinton House (Monongalia County, West Virginia)
Putnam Memorial State Park (Fairfield County, Connecticut)
Putnam, Israel, Wolf Den (Windham County, Connecticut)
Puu o Mahuka Heiau (Honolulu County, Hawaii)
Puunene School (Maui County, Hawaii)
Quaker Bridge (Mercer County, Pennsylvania)
Quarai (Torrance County, New Mexico)
Quechee Gorge Bridge (Windsor County, Vermont)
Steel arch bridge over Ottauquechee River on US 4 in Hartford
Queen Emma's Summer Home (Honolulu County, Hawaii)
Quincy Shore Drive (Norfolk County, Massachusetts)
Quincy, Dorothy, Homestead (Norfolk County, Massachusetts)
Racine County Courthouse (Racine County, Wisconsin)
Racoon Creek RDA (Beaver County, Pennsylvania)
Radburn-Fair Lawn Station (Bergen County, New Jersey)
Railroad Exchange Building (Muskogee County, Oklahoma)
Rainbow Arch Bridge (Morgan County, Colorado)
Eleven-span Marsh arch bridge over South Platte River on CO 52, just north of Fort Morgan
Rainey's Cabin (Fairbanks North Star Borough, Alaska)
Ramsaysburg Homestead (Warren County, New Jersey)
Rancho El Encino (Los Angeles County, California)
Rapallo Viaduct (Middlesex County, Connecticut)
Rapps Bridge (Chester County, Pennsylvania)
Raritan Station (Somerset County, New Jersey)
Ravensburg State Park (Clinton County, Pennsylvania)
Reading Hardware Company Butt Works (Berks County, Pennsylvania)
Reads Landing Overlook (Wabasha County, Minnesota)
Red Bank Passenger Station (Monmouth County, New Jersey)
Red Cliff Bridge (Eagle County, Colorado)
Steel deck arch bridge over Eagle River, Union Pacific Railroad, and Water Street on US 24 at Red Cliff
Red Cloud Bridge (Webster County, Nebraska)
Through truss bridge over Republican River on US 281, 2 mi. south of Red Cloud
Red Covered Bridge (Bureau County, Illinois)
Covered bridge over Bureau Creek on Old Dad Joe Trail in Princeton
Red Hat Cell Block, Louisiana State Penitentiary (West Feliciana Parish, Louisiana)
Red Hill Fire Observation Station (Ulster County, New York)
Red Mountain Shelter (Litchfield County, Connecticut)
Red River Trail: Crow Wing Section (Crow Wing County, Minnesota)
Red River Valley University (Richland County, North Dakota)
Reed Gold Mine (Cabarrus County, North Carolina)
Reed Hall (Allegheny County, Pennsylvania)
Regina Shipwreck Site (Manatee County, Florida)
Register Cliff (Platte County, Wyoming)
Register Rock (Power County, Idaho)
Relic Hall (Franklin County, Idaho)
Reppy Avenue Bridge (Gila County, Arizona)
Luten arch bridge over Bloody Tanks Wash on Reppy Avenue in Miami
Research Plot 2 (Cass County, North Dakota)
Research Plot 30 (Cass County, North Dakota)
Reservoir Avenue Sewage Pumping Station (Providence County, Rhode Island)
Rev. George B. Hitchcock House (Cass County, Iowa)
Revere Beach Reservation (Suffolk County, Massachusetts)
Revere Beach Reservation Historic District (Suffolk County, Massachusetts)
Reynolds Bridge (Litchfield County, Connecticut)
Reynoldsburg--Paris Road (Benton County, Tennessee)
Rhode Island State Airport Terminal (Kent County, Rhode Island)
Rhode Island Statehouse (Providence County, Rhode Island)
Rhodes Memorial Hall (Fulton County, Georgia)
Ribault Inn Club (Duval County, Florida)
Rice Hall (Tompkins County, New York)
Richard Lieber Log Cabin (Parke County, Indiana)
Richards, Laura, House (Kennebec County, Maine)
Ricker Pond State Park (Caledonia County, Vermont)
Ridenbaugh Hall (Latah County, Idaho)
Ridge Avenue Bridge in Philadelphia (Philadelphia County, Pennsylvania)
Ridgway Armory (Elk County, Pennsylvania)
Ridley Creek State Park (Delaware County, Pennsylvania)
Ringgold Depot (Catoosa County, Georgia)
Ringwood Manor (Passaic County, New Jersey)
Rio Felix Bridge At Hagerman (Chaves County, New Mexico)
Rio Grande Bridge at Radium Springs (Dona Ana County, New Mexico)
Rio Grande Bridge at San Juan Pueblo (Rio Arriba County, New Mexico)
Rio Grande Gorge Bridge (Taos County, New Mexico)
Rio Grande Railroad Viaduct (Fremont County, Colorado)
Tee beam bridge over the Union Pacific Railroad on CO 120
Rio Puerco Bridge (Bernalillo County, New Mexico)
Parker through truss bridge over the Rio Puerco on the frontage road (formerly US 66) at exit 140 on IH-40
Riordan Estate (Coconino County, Arizona)
Rippleton Schoolhouse (Madison County, New York)
Rising Sun Tavern (Fredericksburg, Virginia)
Ritch Hall (Grant County, New Mexico)
Rito Seco Creek Culvert (Costilla County, Colorado)
River Road Stone Arch Railroad Bridge (New London County, Connecticut)
Rivers Bridge State Park (Bamberg County, South Carolina)
Historic Civil War battleground
Riverside (Ravalli County, Montana)
Riverside Park and Drive (New York County, New York)
Roaring River State Park Bath House (Barry County, Missouri)
Roaring River State Park Dam/Spillway (Barry County, Missouri)
Roaring River State Park Hotel (Barry County, Missouri)
Robbers Cave State Park (Latimer County, Oklahoma)
Robert Allerton Estate (Piatt County, Illinois)
Robert E. Lee Monument (Richmond, Virginia)
Robert Fulton Birthplace (Lancaster County, Pennsylvania)
Robert Gamble House (Manatee County, Florida)
Robert Mills Dairy Barn (San Mateo County, California)
Robert Ralston School (Philadelphia County, Pennsylvania)
Robert Street Bridge (Ramsey County, Minnesota)
Roberts Hall (Tompkins County, New York)
Robinson Hall--Louisiana Tech University (Lincoln Parish, Louisiana)
Robinson House (New Castle County, Delaware)
Robinson-Herrling Sawmill (Sheboygan County, Wisconsin)
Rock Castle (Sumner County, Tennessee)
Rock Creek Stage Station (Routt County, Colorado)
Rock Island Depot (Grady County, Oklahoma)
Rock Island Historic District (Door County, Wisconsin)
Rock Island Light Station (Jefferson County, New York)
Rockefeller Cottage (Glynn County, Georgia)
Rockingham (Somerset County, New Jersey)
Rocky Creek Bridge No. 01089 (Lincoln County, Oregon)
Rocky Mount (Sullivan County, Tennessee)
Rocky Neck Pavilion (New London County, Connecticut)
Rocky Point CCC Properties (Benewah County, Idaho)
Rogers Administration Building (San Miguel County, New Mexico)
Rogue River Bridge No. 01172 (Curry County, Oregon)
Concrete arch bridge over Rogue River on US 101 in Gold Beach