House

Oscar F. Lyons House (Summit County, Utah)
Oscar G. and Mary H. Burch House (Cole County, Missouri)
Oscar Gill House (Anchorage, Alaska)
Oscar H. Chapman House (Ellis County, Texas)
Oscar Lindsay House (Harris County, Texas)
Oscar M. Booth House (Juab County, Utah)
Oscar M. Gottschall House (Montgomery County, Ohio)
Oscar Nichols House (Scott County, Iowa)
Oscar Olson House (Isanti County, Minnesota)
Oscar P. Thomas House (Taylor County, Texas)
Oscar Roeser House (Hall County, Nebraska)
Oscar Taylor House (Stephenson County, Illinois)
Osgood Family House (Oxford County, Maine)
Osgood Gamekeeper's Lodge (Pitkin County, Colorado)
Osgood Hill (Essex County, Massachusetts)
Osgood, Col. John, House (Essex County, Massachusetts)
Osgood, Nathaniel, House (Androscoggin County, Maine)
Osgood, Samuel, House (Essex County, Massachusetts)
Osgood-Kuhnhausen House (Pitkin County, Colorado)
Oskar G. Stonorov House (Chester County, Pennsylvania)
Osmund Osmundson House (Rice County, Minnesota)
Osmyn and Emily Deuel House (Davis County, Utah)
Ossabaw Island (Chatham County, Georgia)
Ossian H. Sweet House (Wayne County, Michigan)
Osterloh House (Cape Girardeau County, Missouri)
Osterman House (Walla Walla County, Washington)
Oswald J. Nitschke House (Union County, New Jersey)
Oswald West Coastal Retreat (Clatsop County, Oregon)
Otha Walker Homestead (White County, Arkansas)
Other C. Wamsley House (Ravalli County, Montana)
Othniel C. Marsh House (New Haven County, Connecticut)
Othniel Looker House (Hamilton County, Ohio)
Otho Poole House (Multnomah County, Oregon)
Otis Hospital (Mercer County, Ohio)
Otis House (Yavapai County, Arizona)
Otis L. Brown House (Summit County, Utah)
Otis Starkey House (Jefferson County, New York)
Otis, (First) Harrison Gray, House (Suffolk County, Massachusetts)
Otis, (Second) Harrison Gray, House (Suffolk County, Massachusetts)
Otis--Wyman House (Middlesex County, Massachusetts)
Otranto Plantation (Berkeley County, South Carolina)
Ottawa House (Eau Claire County, Wisconsin)
Otterburn (Bedford County, Virginia)
Otto Brinkmann House (Kendall County, Texas)
Otto Carmichael House (Delaware County, Indiana)
Otto F. Eitel House (Jefferson County, Kentucky)
Otto F. Fiebing House (Milwaukee County, Wisconsin)
Historically significant Ernest Flagg designed stone masonry house.
Otto H. Baring House (Harris County, Texas)
Otto House (Harris County, Texas)
Otto Huechling House (Grant County, New Mexico)
Otto J. Hager House (Allamakee County, Iowa)
Otto Kulage House (St. Louis, Missouri)
Otto L. Uhlig House (Lawrence County, South Dakota)
Otto Meerscheidt House (Bexar County, Texas)
Otto P. Kissel House (Washington County, Wisconsin)
Two and One Half Story Clapboard House
Otto Ripple Agency (St. Louis County, Missouri)
Otto Schell House (Brown County, Minnesota)
Otto W. and Ida L. Nelson House (Multnomah County, Oregon)
Otway Henderson House (McCormick County, South Carolina)
Otwell (Talbot County, Maryland)
Otzenberger House (St. Louis, Missouri)
Oulagisket (Putnam County, New York)
Outlands in the Eighty Acres (Monterey County, California)
Outlet Gates and Gatekeeper's Cabin (Placer County, California)
Overbrook (Davidson County, Tennessee)
Overcarsh House (Mecklenburg County, North Carolina)
Overfelt-Campbell-Johnston House (Jackson County, Missouri)
Overholser Mansion (Oklahoma County, Oklahoma)
Overholt House (Wayne County, Ohio)
Overlook (Berkeley County, West Virginia)
Overlook (Buncombe County, North Carolina)
Oversen, Julius and Anine House (Woodbury County, Iowa)
Overstreet House (Le Flore County, Oklahoma)
Oviatt House (Winnebago County, Wisconsin)
Ovide Broussard House (Vermilion Parish, Louisiana)
OW Ranch (Big Horn County, Montana)
Owen and Margaret Oliver House (Waukesha County, Wisconsin)
A rural Italinate farmhouse that has changed little over its lifetime.
Owen Coachman House (Cape May County, New Jersey)
Owen E. LeFevre House (Denver County, Colorado)
Owen Estate (Arapahoe County, Colorado)
Owen Lovejoy Homestead (Bureau County, Illinois)
Owen Martin House (Stone County, Arkansas)
Owen Plantation House (Jefferson County, Alabama)
Owen Tudor Hedges House (Berkeley County, West Virginia)
Owen--Cox House (Williamson County, Tennessee)
Owen--Primm House (Williamson County, Tennessee)
Owen-Harrison House (Rowan County, North Carolina)
Owens--McCoy House (Jackson County, Missouri)
Owens-Thomas House (Chatham County, Georgia)
Owings House (Pulaski County, Arkansas)
Oxford Historic District (Scott County, Kentucky)
Oxford House (Grand Forks County, North Dakota)
Oxland (Rapides Parish, Louisiana)
Oxmoor (Jefferson County, Kentucky)
Oxon Cove Park (Prince George's County, Maryland)
Oxon Hill Manor (Prince George's County, Maryland)
Ozias Goodwin House (Suffolk County, Massachusetts)
Ozmer House (Columbia County, Arkansas)
P. A. Fry House (Bastrop County, Texas)
P. C. Warner First House (Pinal County, Arizona)
P. J. Heilman House (Logan County, Oklahoma)
P. M. Craigmiles House (Bradley County, Tennessee)
P. P. Raymond House (Poweshiek County, Iowa)
P. W. Inskeep House (Hardy County, West Virginia)
P.D. Gwaltney Jr., House (Isle of Wight County, Virginia)
P.D. Houston Jr. House (Davidson County, Tennessee)
Pablo Soto House (Cochise County, Arizona)
Pace House (Jeff Davis County, Georgia)
Pace-King House (Richmond, Virginia)
Pacific Coast Company House No. 75 (King County, Washington)
Pacific Curios Antiques (Richland County, Ohio)
Pacific Spruce Saw Mill Tenant Houses (Lincoln County, Oregon)
Packard-Doubler House (Cuyahoga County, Ohio)
Packer House (Bergen County, New Jersey)
Paddison Ranch Buildings (Los Angeles County, California)
Paddock Mansion (Jefferson County, New York)
Paddock--Hubbard House (Jackson County, Michigan)
Pagan-Fletcher House (Nassau County, New York)
Page (Trimble County, Kentucky)
Page House (Sullivan County, New York)
Page Soddy (Harper County, Oklahoma)
Page, Christopher, House (Middlesex County, Massachusetts)
Page, H. P., House (Middlesex County, Massachusetts)
Page, Nathaniel, House (Middlesex County, Massachusetts)
Page--Gilbert House (Travis County, Texas)
Page-Bell House (Trimble County, Kentucky)
Page-Vawter House (Fayette County, West Virginia)
Paget House and Heigold House Facade (Jefferson County, Kentucky)
Paige--DeCrow--Weir House (Williamson County, Texas)
Paillet House (Ellis County, Texas)
Paine Estate (Norfolk County, Massachusetts)
Paine House (Kent County, Rhode Island)
Paine House (Clay County, Illinois)
Paine, Robert Treat, Jr., House (Middlesex County, Massachusetts)
Paine, Timothy, House (Worcester County, Massachusetts)
Paine--Dodge House (Essex County, Massachusetts)
Painesdale (Houghton County, Michigan)
Paisley J. W., House (Forsyth County, North Carolina)
Paisley-Rice Log House (Orange County, North Carolina)
Palatine German Frame House (Herkimer County, New York)
Palm Cottage (Collier County, Florida)
Palm Cottage (Miami-Dade County, Florida)
Palm Cottage Gardens (Orange County, Florida)
Palmer Brother's Octagons (La Crosse County, Wisconsin)
Two octagon houses located in West Salem, one serving as the visitor center.
Palmer House (Summit County, Ohio)
Palmer House (Monroe County, Arkansas)
Palmer House (Jefferson County, Florida)
Palmer House (Yamhill County, Oregon)
Palmer, Judge Peter L. House (Denver County, Colorado)
Palmer--Lewis Estate (Westchester County, New York)
Palmer--Northrup House (Washington County, Rhode Island)
Palmer-Ferril House (Denver County, Colorado)
Palmer-Marsh House (Beaufort County, North Carolina)
Palmer-Perkins House (Jefferson County, Florida)
Palmetto Court (Los Angeles County, California)
Palo Alto Dependency (Ascension Parish, Louisiana)
Palo Alto Plantation (Ascension Parish, Louisiana)
Palo Alto Plantation (Onslow County, North Carolina)
Pampell-Day House (Washington County, Texas)
Pancrazi House (Yuma County, Arizona)
Panoramic Hill (Alameda County, California)
Panther's Den (Somerset County, Maryland)
Panton House (Gallatin County, Montana)
Pap Madison Cabin (Pennington County, South Dakota)
Paradise Block Historic District (Mahaska County, Iowa)
Paradise Manor (Washington County, Maryland)
Pardee House (Alameda County, California)
Paris and Anna Fletcher House (Addison County, Vermont)
Paris Mason Building (Jersey County, Illinois)
Paris Q. Rockett House (Ellis County, Texas)
Paris Teater House (Garrard County, Kentucky)
Parish House (Storey County, Nevada)
Park Avenue Houses (New York County, New York)
Park Dinor (Erie County, Pennsylvania)
Park Gate (Prince William County, Virginia)
Park Hill (Denver County, Colorado)
Park Lodge (Essex County, Massachusetts)
Park Manor Historic District (Jackson County, Missouri)
Park Street Row (Cumberland County, Maine)
Park-McCullough House (Bennington County, Vermont)
Parkdale Ranger Station (Hood River County, Oregon)
Parke-Moore House (Garrard County, Kentucky)
Parker Farmhouse (Madison County, New York)
Parker House (Lincoln County, Arkansas)
Parker House (Hancock County, Maine)
Parker House (Middlesex County, Connecticut)
Parker House (Clayton County, Iowa)
Parker House (Pulaski County, Kentucky)
Parker House (Middlesex County, Massachusetts)
Parker House (Middlesex County, Massachusetts)
Parker House (Middlesex County, Massachusetts)
Parker House (Orange County, California)
Parker Mill Complex (Washtenaw County, Michigan)
Parker Tavern (Middlesex County, Massachusetts)
Parker's Ford (Chester County, Pennsylvania)
Parker, Capt. Nathaniel, Red House (Middlesex County, Massachusetts)
Parker, Edmund, Jr., House (Middlesex County, Massachusetts)
Parker, Harrison, Sr., House (Middlesex County, Massachusetts)
Parker, James, House (Middlesex County, Massachusetts)