Newtown Friends Meetinghouse and Cemetery (Bucks County, Pennsylvania)
Niblock--Yacovetta Terrace (Denver County, Colorado)
Nichol House (Jefferson County, Arkansas)
Nicholai Fechin House (Taos County, New Mexico)
Nicholas Girod House (Orleans Parish, Louisiana)
Nicholas Johnson Mill (Berks County, Pennsylvania)
Nicholas Marnach House (Winona County, Minnesota)
Nicholas Newlin House (Delaware County, Pennsylvania)
Nick J. Bielenberg House (Powell County, Montana)
Nick's Hamburger Shop (Brookings County, South Dakota)
Nickerson Mansion (Barnstable County, Massachusetts)
Nicking House (Johnson County, Iowa)
Nicolai--Cake--Olson House (Multnomah County, Oregon)
Niewerth Building (Carroll County, Indiana)
Nitrate Village No. 1 Historic District (Colbert County, Alabama)
Nitre Hall (Delaware County, Pennsylvania)
Noble Hall (Lee County, Alabama)
A historic Greek Revival style plantation house in Auburn, Alabama.
Nogales High School (Santa Cruz County, Arizona)
Nogales Steam Laundry Building (Santa Cruz County, Arizona)
Nokomis Knoll Residential Historic District (Hennepin County, Minnesota)
Nordlund House (Denver County, Colorado)
Norfolk City Hall (Norfolk, Virginia)
Normal Station Historic District (Shelby County, Tennessee)
Normal Theater (McLean County, Illinois)
Norman and Florence B. Carmichael House (San Diego County, California)
Norman B. Streeter Homestead (Custer County, South Dakota)
Norman Tromanhauser House (Jackson County, Missouri)
Normandy Farms (Montgomery County, Ohio)
Normandy Grange (Putnam County, New York)
Normandy Isles Historic District (Miami-Dade County, Florida)
Norris House (Santa Clara County, California)
North Atlantic Street Historic District (Coffee County, Tennessee)
North Brentwood Historic District (Prince George's County, Maryland)
North Broadway Street Historic District (Brown County, Wisconsin)
North Caldwell Historic District (Canyon County, Idaho)
North End Historic District (Providence County, Rhode Island)
North End Historic District (El Paso County, Colorado)
North Esplanade Historic District (Leavenworth County, Kansas)
North First Street Historic District (Milwaukee County, Wisconsin)
Interesting residential neighborhood, two miles from downtown, NRHP listed August 2, 1984
North Grant Boulevard Historic District (Milwaukee County, Wisconsin)
A broad, linear, tree-lined street distinguished by extra wide parkways with double rows of shade trees
North Harper Avenue Historic District (Los Angeles County, California)
North Hill Preservation District (Escambia County, Florida)
North Hills Historic District (Knox County, Tennessee)
North Lamar Historic District (Lafayette County, Mississippi)
North Main Street Historic District (Pulaski County, Kentucky)
North Main Street Historic District (Forrest County, Mississippi)
North Manor Apartments (Hinds County, Mississippi)
North Park Street Historic District (Tate County, Mississippi)
North Point North Historic District (Milwaukee County, Wisconsin)
Northern half of Milwaukee's North Point Historic District
North Point South Historic District (Milwaukee County, Wisconsin)
Southern portion of Milwaukee's North Point Historic Districts
North Sherman Boulevard Historic District (Milwaukee County, Wisconsin)
An architecturally impressive, early twentieth century, residential neighborhood
North Shilling Historic District (Bingham County, Idaho)
North Shore Historic District (Pinellas County, Florida)
North Slope Historic District (Pierce County, Washington)
North State Street Historic District (Piatt County, Illinois)
Northboro Park Historic District (Palm Beach County, Florida)
Northbrook Historic District (Chester County, Pennsylvania)
Northeast Evanston Historic District (Cook County, Illinois)
Northeast Lancaster Township Historic District (Lancaster County, Pennsylvania)
Northern Pacific Depot and Freight House (Grand Forks County, North Dakota)
Northern Pacific Office Building (Pierce County, Washington)
Northern Pacific Railway Depot (Shoshone County, Idaho)
Northport Historic District (Tuscaloosa County, Alabama)
Northwest Historic District (Palm Beach County, Florida)
Northwood Avenue Historic District (Madison County, Tennessee)
Northwood Historic District (Baltimore, Maryland)
Norton House (Palm Beach County, Florida)
Norwalk Memorial Hospital (Huron County, Ohio)
Norwood Boulevard Historic District (Jefferson County, Alabama)
Norwood Hills Country Club (St. Louis County, Missouri)
Norwood Park Historical District (Cook County, Illinois)
Nottoway Plantation House (Iberville Parish, Louisiana)
Noves, Charles W., House (Middlesex County, Massachusetts)
Nowland, J. Martin, House (Norfolk County, Massachusetts)
Nuckolls County Courthouse (Nuckolls County, Nebraska)
Nuestra Senora de Luz Church and Cemetery (Santa Fe County, New Mexico)
Nutt--Trussell Building (Dallas County, Arkansas)
Nystrom Guest House (Washoe County, Nevada)
O'Keefe--Clark Boarding House (Jackson County, Mississippi)
O. Arthur Kirkman House and Outbuildings (Guilford County, North Carolina)
O. E. Rolvaag House (Rice County, Minnesota)
O. L. Price House (Multnomah County, Oregon)
Oak Circle Historic District (Cook County, Illinois)
Oak Hill (Fauquier County, Virginia)
Oak Hill Historic District (Washington County, Maryland)
Oak Park Historic District (Montgomery County, Pennsylvania)
Oakdale Historic District (Allen County, Indiana)
Oakdene (Staunton, Virginia)
Oakham (Warren County, Tennessee)
Oakland (Adams County, Mississippi)
Oakland (Weakley County, Tennessee)
Oakland (Adams County, Mississippi)
Oakland Block (Whatcom County, Washington)
Oakland Free Library--23rd Avenue Branch (Alameda County, California)
Oakland Free Library--Alden Branch (Alameda County, California)
Oakland Free Library--Melrose Branch (Alameda County, California)
Oakland Historic District (Douglas County, Oregon)
Oakland Historic District (Maricopa County, Arizona)
Oakland Park Elementary School (Broward County, Florida)
Oakland Plantation (Bladen County, North Carolina)
Oakland Waterfront Warehouse District (Alameda County, California)
Oaklands (Chester County, Pennsylvania)
Oaklands, The (Kalamazoo County, Michigan)
Oaklawn Plantation (Natchitoches Parish, Louisiana)
Oakleigh (Mobile County, Alabama)
Oakley (Fauquier County, Virginia)
Oaks Historic District (Forrest County, Mississippi)
Oaks Historic District, The (Camden County, New Jersey)
Oaks, The (Hinds County, Mississippi)
Oakton Historic District (Cook County, Illinois)
Oakville Grocery (Napa County, California)
Oakwood (Licking County, Ohio)
Oakwood (Adams County, Mississippi)
Oakwood Historic District (Guilford County, North Carolina)
Oasis Court (Cochise County, Arizona)
Oates Building (Polk County, Florida)
Oatlands (Loudoun County, Virginia)
Ocala Historic District (Marion County, Florida)
Ocean Drive Historic District (Newport County, Rhode Island)
Ocean Hall (St. Mary's County, Maryland)
Ocean Spray Hotel (Miami-Dade County, Florida)
Oceanside City Hall and Fire Station (San Diego County, California)
Ocilla Public School (Irwin County, Georgia)
Ocoee Street Historic District (Bradley County, Tennessee)
Octagon House (Fairfield County, Connecticut)
Octagon House (Fairfield County, Connecticut)
destroyed by fire in 1985
Octagonal Schoolhouse (Kent County, Delaware)
Odd Fellows Building (Tehama County, California)
Odd Fellows Rest Cemetery (Orleans Parish, Louisiana)
Odd Fellows Temple (Los Angeles County, California)
Oddfellows Building (Middlesex County, Massachusetts)
Officer Farmstead (Overton County, Tennessee)
Officer's Club, Douglas Prisoner of War (Converse County, Wyoming)
Officer's Quarters (Pima County, Arizona)
Ogden House (Delaware County, Pennsylvania)
Oglethorpe Avenue Historic District (Clarke County, Georgia)
Oheka Castle (Suffolk County, New York)
Ohlman-Shannon House (Yankton County, South Dakota)
Okanogan County Courthouse (Okanogan County, Washington)
Okehocking Historic District (Chester County, Pennsylvania)
Oklahoma City University (Oklahoma County, Oklahoma)
Okolona College (Chickasaw County, Mississippi)
Okolona Historic District (Chickasaw County, Mississippi)
Olaf Lee House (Ramsey County, Minnesota)
Old Armijo School (Bernalillo County, New Mexico)
Old Asbury Methodist Church (New Castle County, Delaware)
Old Beechwold Historic District (Franklin County, Ohio)
Old Bergen Church (Hudson County, New Jersey)
Old Boulder City Hospital (Clark County, Nevada)
Old Brazoria County Courthouse (Brazoria County, Texas)
Old Centre, Centre College (Boyle County, Kentucky)
Old Charles Town Historic District (Jefferson County, West Virginia)
Old City Hall (Santa Clara County, California)
Old City Hall Historic District (Pierce County, Washington)
Old City Waterworks (Leon County, Florida)
Old Cokesbury and Masonic Female College and Conference School (Greenwood County, South Carolina)
Historic Female College in Cokesbury, SC
Old College Historic District (New Castle County, Delaware)
Old Colleton County Jail (Colleton County, South Carolina)
Old Courthouse (Charleston County, South Carolina)
Old Courthouse (Newberry County, South Carolina)
Old courthouse building in Newberry, SC
Old Courthouse (Marengo County, Alabama)
The third building to serve as the courthouse for Marengo County, Alabama.
Old Courthouse, Warren County (Warren County, Mississippi)
Old Customshouse (New Castle County, Delaware)
Old Dauphin Way Historic District (Mobile County, Alabama)
Old Davidson County Courthouse (Davidson County, North Carolina)
Old Dawson Place (Muscogee County, Georgia)
Old Dominion Bank Building (Alexandria, Virginia)
Old Federal Building and Post Office (Victoria County, Texas)
Old First National Bank Building (Marion County, Oregon)
Old Ford Dairy (New Castle County, Delaware)
Old Forge Farm (Frederick County, Virginia)
Old Fort Mitchell Historic District (Kenton County, Kentucky)
Old Fourth Ward Historic District (Rock County, Wisconsin)
Old Gaissert Homeplace (Spalding County, Georgia)
Old Garfield School (Marion County, Oregon)
Old Governor's Mansion (Baldwin County, Georgia)
Old Greenwood High School (Greenwood County, South Carolina)
Historic school in Greenwood, SC
Old Hilton Hotel (Bernalillo County, New Mexico)
Old Kennett Meetinghouse (Chester County, Pennsylvania)
Old Land Office Building (Travis County, Texas)