Normandy Park (Morris County, New Jersey)
Norris House (Santa Clara County, California)
Norris Miller House (Winneshiek County, Iowa)
Norris Staples House (Clatsop County, Oregon)
Norris-Stirling House (Harford County, Maryland)
North Bend (Charles City County, Virginia)
North Bend (Pointe Coupee Parish, Louisiana)
North Carolina Executive Mansion (Wake County, North Carolina)
North Fork Guard Station No. 1142 (Lewis County, Washington)
North Manor Apartments (Hinds County, Mississippi)
North Mansion and Tenant House (Schenectady County, New York)
North Wales (Fauquier County, Virginia)
North Washington Avenue Workers' House (Rockingham County, North Carolina)
Northcutt House (Gregg County, Texas)
Northcutt Plantation (Warren County, Tennessee)
Northington--Beach House (Montgomery County, Tennessee)
Northrup House (Allen County, Kansas)
Northrup--Gilbert House (Oswego County, New York)
Northside Historic Residential District (Fayette County, Kentucky)
Northup, Stephen, House (Washington County, Rhode Island)
Northway Residence (Rosebud County, Montana)
Northwest Company Post (Pine County, Minnesota)
Norton House (Yuma County, Arizona)
Norton House (New Haven County, Connecticut)
Norton House (Bristol County, Massachusetts)
Norton House (Palm Beach County, Florida)
Norton House Historic District (Cumberland County, Maine)
Norton, Charles H., House (Hartford County, Connecticut)
Norton, William F., House (Franklin County, Maine)
Norton-Burnham House (Jefferson County, New York)
Nortonia Boarding House (Washoe County, Nevada)
Norumbega (Knox County, Maine)
Norumbega Carriage House (Knox County, Maine)
Norway Township Stone House (Fillmore County, Minnesota)
Norwegian Buildings at Heg Park (Racine County, Wisconsin)
Outdoor museum of Norwegian heritage of the area
Norwell Residence (Hamilton County, Ohio)
Norwood (Powhatan County, Virginia)
Norwood (Clarke County, Virginia)
Norwood House (Sussex County, Delaware)
Norwood, Andrew S., House (New York County, New York)
Norwood--Hyatt House (Essex County, Massachusetts)
Notleymere (Madison County, New York)
Noto House (Brazos County, Texas)
Nottoway Plantation House (Iberville Parish, Louisiana)
Noves, Charles W., House (Middlesex County, Massachusetts)
Nowack House (Sheboygan County, Wisconsin)
The first home built in Random Lake.
Nowak, Dr. John J., House (Erie County, New York)
Nowell-Mayerburg-Oliver House (Johnston County, North Carolina)
Nowlan-Dietrich House (Adams County, Nebraska)
Nowland House (Tioga County, New York)
Nowland, J. Martin, House (Norfolk County, Massachusetts)
Noxontown (New Castle County, Delaware)
Noyes Cottage (Franklin County, New York)
Noyes Mansion (Napa County, California)
Noyes, J.A., House (Middlesex County, Massachusetts)
Noyes, James, House (Essex County, Massachusetts)
Noyes--Parris House (Middlesex County, Massachusetts)
Nuckolls House (Pottawatomie County, Oklahoma)
Nuckolls-Jefferies House (Cherokee County, South Carolina)
Historic home south of Gaffney, SC
Nugent's Crossroad Historic District (Woodford County, Kentucky)
Nuits (Westchester County, New York)
Null House (Baltimore, Maryland)
Numertia Plantation (Orangeburg County, South Carolina)
Nun's Green (Worcester County, Maryland)
Nurre-Royston House (Hamilton County, Ohio)
Nut Grove (Albany County, New York)
Nutting Homestead, The (Oxford County, Maine)
Nutwood (Troup County, Georgia)
Nutwood Place (Champaign County, Ohio)
Nyberg--Swanson House (Broward County, Florida)
Nye House (Dodge County, Nebraska)
Nye, Benjamin, Homestead (Barnstable County, Massachusetts)
Nye, Elnathan, House (Barnstable County, Massachusetts)
O'Bannon Homestead (Cass County, Missouri)
O'Bier House (Webster Parish, Louisiana)
O'Blenis House (Bergen County, New Jersey)
O'Connor House (Pembina County, North Dakota)
O'Dea House (Prince George's County, Maryland)
O'Dell House (Cocke County, Tennessee)
O'Donnell Building (Vanderburgh County, Indiana)
O'Donnell House (Sumter County, South Carolina)
O'Donohue, C. A., House (Suffolk County, New York)
O'Hara House (Ravalli County, Montana)
O'Kane--Jacobs House (Franklin County, Arkansas)
O'Shea House (Carbon County, Montana)
O. A. E. Blyberg House (Otter Tail County, Minnesota)
O. Arthur Kirkman House and Outbuildings (Guilford County, North Carolina)
O. B. McFadden House (Lewis County, Washington)
O. B. Sims House (Ellis County, Texas)
O. C. Barber Creamery (Summit County, Ohio)
O. C. Sarles House (Traill County, North Dakota)
O. D. and Ada Dillingham House (Taylor County, Texas)
O. E. Payne House (Lucas County, Iowa)
O. E. Rolvaag House (Rice County, Minnesota)
O. E. Walker House (Mohave County, Arizona)
O. F. and Mary Prigden House (DeWitt County, Texas)
O. F. Short House (Ada County, Idaho)
O. J. Daniels House (Jerome County, Idaho)
O. K. Palmer House (Lewis County, Washington)
O. L. and Josephine Morgan House (Jefferson County, Washington)
O. L. Dunaway House (Faulkner County, Arkansas)
O. L. Price House (Multnomah County, Oregon)
O. P. Wickham House (Pottawattamie County, Iowa)
O. T. Baker House (Lorain County, Ohio)
O. W. Getchell House (Mendocino County, California)
O.B. Grant House (Elk County, Pennsylvania)
O.F. and Lulu E. Fryer House (Jefferson County, Iowa)
O.J. Gendron Ranch (Yakima County, Washington)
O.W. Francis House (Jewell County, Kansas)
Oak Alley Plantation (St. James Parish, Louisiana)
Oak Crest (Isle of Wight County, Virginia)
Oak Dell (Morris County, New Jersey)
Oak Forest (Hanover County, Virginia)
Oak Glen (Newport County, Rhode Island)
Oak Grove (Cumberland County, North Carolina)
Oak Grove (Hampton County, South Carolina)
Oak Grove (Jefferson County, Mississippi)
Oak Grove (Charles County, Maryland)
Oak Grove (Northampton County, Virginia)
Oak Grove (Campbell County, Virginia)
Oak Hill (Fairfax County, Virginia)
Oak Hill (Loudoun County, Virginia)
Oak Hill (Ross County, Ohio)
Oak Hill (Fauquier County, Virginia)
Oak Hill (Marshall County, Kentucky)
Oak Hill (Colonial Heights, Virginia)
Oak Hill (Columbia County, New York)
Oak Hill (Cumberland County, Virginia)
Oak Hill Cottage (Richland County, Ohio)
Oak Hill Estate (Fayette County, Pennsylvania)
Oak Island (Charleston County, South Carolina)
Oak Knoll (Middlesex County, Massachusetts)
Oak Lawn (Amherst County, Virginia)
Oak Lawn (Caroline County, Maryland)
Oak Top (Montgomery County, Tennessee)
Oak Tree Cottage (Calhoun County, Alabama)
Oakcliff (Saratoga County, New York)
Oakdale (Chester County, Pennsylvania)
Oakdale Cotton Mill Village (Guilford County, North Carolina)
Oakdene (Staunton, Virginia)
Oakdene Place (Floyd County, Georgia)
Oakes Estate (Essex County, New Jersey)
Oakes, Edward, House (Middlesex County, Massachusetts)
Oakes, J. J., House (Worcester County, Massachusetts)
Oakes-Wood House (Johnson County, Iowa)
Oakforest (Wake County, North Carolina)
Oakham (Warren County, Tennessee)
Oakhill (Calhoun County, Michigan)
Oakhurst (Sumter County, Alabama)
Oakhurst Links (Greenbrier County, West Virginia)
Oaklana (Bertie County, North Carolina)
Oakland (Halifax County, North Carolina)
Oakland (Hanover County, Virginia)
Oakland (Adams County, Mississippi)
Oakland (Wood County, West Virginia)
Oakland (Meriwether County, Georgia)
Oakland (Weakley County, Tennessee)
Oakland (Charles County, Maryland)
Oakland (Adams County, Mississippi)
Oakland (Sumner County, Tennessee)
Oakland (Frederick County, Maryland)
Oakland Plantation (Bladen County, North Carolina)
Oakland Plantation (Calhoun County, South Carolina)
Oakland Plantation (Edgecombe County, North Carolina)
Oakland Plantation (Aiken County, South Carolina)
Oakland Plantation House (Charleston County, South Carolina)
Oakland Plantation House (East Feliciana Parish, Louisiana)
Oakland/Henry House (Christian County, Kentucky)
Oaklands (Rutherford County, Tennessee)
Oaklands (Kennebec County, Maine)
Oaklands (Chester County, Pennsylvania)
Oaklands, The (Kalamazoo County, Michigan)
Oaklawn Manor (St. Mary Parish, Louisiana)
Oaklawn Plantation (Natchitoches Parish, Louisiana)
Oakleigh (Mobile County, Alabama)
Oakley (Spotsylvania County, Virginia)
Oakley (Fauquier County, Virginia)
Oakley (Sumner County, Tennessee)
Oakley (Northumberland County, Virginia)
Oakley Hill (Hanover County, Virginia)
Oakley Plantation House (West Feliciana Parish, Louisiana)
Oakley, John, House (Suffolk County, New York)
Oaklyn Plantation (Darlington County, South Carolina)
Oakmont (Pitt County, North Carolina)
Oakmoor (Hopkins County, Kentucky)
Oaks Cloister (Philadelphia County, Pennsylvania)
Oaks II (Montgomery County, Maryland)
Oaks, The (Hinds County, Mississippi)
Oaks, The (Los Angeles County, California)
Oaks, The (West Feliciana Parish, Louisiana)
Oaks, The (Staunton, Virginia)
Oaks, The (De Soto Parish, Louisiana)
Oakslea Place (Madison County, Tennessee)
Oakview (Marshall County, Mississippi)
Oakwold Plantation House (Avoyelles Parish, Louisiana)
Oakwood (Anne Arundel County, Maryland)
Oakwood (Burlington County, New Jersey)
Oakwood (Salt Lake County, Utah)