Built during 1890s

Nellie Johnstone No. 1 (Washington County, Oklahoma)
Nels A. Holmes Farmstead (Iron County, Michigan)
Nels A. Nelson House (Salt Lake County, Utah)
Nels and Minnie Jenson House (Box Elder County, Utah)
Nelson County Courthouse (Nelson County, Kentucky)
Nelson School (Washington County, Minnesota)
Nelson Tenement (Jackson County, Mississippi)
Nemaha County Courthouse (Nemaha County, Nebraska)
Nephi and Annie Kindred House (Utah County, Utah)
Ness County Bank (Ness County, Kansas)
Nestor P. Eaton House (Socorro County, New Mexico)
Netcott--Pfeiffer House (Butler County, Iowa)
Netherwood Station (Union County, New Jersey)
Neville House (Mobile County, Alabama)
New Bern Municipal Building (Craven County, North Carolina)
New Brick--The Brick Saloon (Pitkin County, Colorado)
New Canal Lighthouse (Orleans Parish, Louisiana)
New Carroll House Hotel (Poweshiek County, Iowa)
New Century Club (New Castle County, Delaware)
New England Building (Cuyahoga County, Ohio)
New Enterprise Tobacco Warehouse (Jefferson County, Kentucky)
New Era Building (Lancaster County, Pennsylvania)
New Era Building (Jackson County, Iowa)
New Fort Brady (Chippewa County, Michigan)
New Germantown Covered Bridge (Perry County, Pennsylvania)
Covered bridge over Shermans Creek on TR 302
New Hanover County Courthouse (New Hanover County, North Carolina)
New Hope Presbyterian Church (Brunswick County, North Carolina)
New Hope Primitive Baptist Church (Ray County, Missouri)
New Kensington Downtown Historic District (Westmoreland County, Pennsylvania)
New Kensington Production Works Historic District (Westmoreland County, Pennsylvania)
New Logus Block (Multnomah County, Oregon)
New Market Hotel and Store (Scott County, Minnesota)
New Ogeechee Missionary Baptist Church (Chatham County, Georgia)
New Opera House (Nemaha County, Nebraska)
New Oxford Train Station Museum (Adams County, Pennsylvania)
Built in 1892 by Western Maryland Railroad this station now serves as a RR museum
New Point Loma Lighthouse (San Diego County, California)
70' tall metal skeletal lighthouse first lit in 1891
New Riding Club (Suffolk County, Massachusetts)
New Salem United Methodist Church (Knox County, Tennessee)
New Vienna Stone Elevated Water Tank (Dubuque County, Iowa)
Stone water tower that served the community until 1983
New Washington Normal School (Clark County, Indiana)
School built in 1894
New York Botanical Gardens (Bronx County, New York)
New York Cash Store (Humboldt County, California)
Eastlake-Stick style Victorian era commercial building built in 1898
New York Public Library (New York County, New York)
New York Public Library and Bryant Park (New York County, New York)
New York Savings Bank (New York County, New York)
New York State Armory (Dutchess County, New York)
New York Yacht Club (New York County, New York)
Newberry House (Pitkin County, Colorado)
Newkirk Central Business District (Kay County, Oklahoma)
Historic Business District
Newland House (Orange County, California)
Newman Block (La Plata County, Colorado)
Newman House (Gallatin County, Montana)
Newry Historic District (Oconee County, South Carolina)
Historic textile mill village district in Oconee County, SC
Newton Copeland Richards House (Shelby County, Tennessee)
Newton Cottage Hospital Historic District (Middlesex County, Massachusetts)
Newton House (Clarke County, Georgia)
Newton Seymour Tubbs House (Custer County, South Dakota)
Newton Street Railway Carbarn (Middlesex County, Massachusetts)
Newtonville United Methodist Church (Albany County, New York)
Niagara Camp (Tuolumne County, California)
Niagara Falls Armory (Niagara County, New York)
Niblock--Yacovetta Terrace (Denver County, Colorado)
Nichelini Winery (Napa County, California)
Nicholas County Courthouse (Nicholas County, West Virginia)
Nicholas Koester Building (Scott County, Iowa)
Nicholas O. Walden House (Clackamas County, Oregon)
Nichols Memorial Library (Rockingham County, New Hampshire)
Nichols, John F., House (Middlesex County, Massachusetts)
Nicolet Public School (Outagamie County, Wisconsin)
Romanesque Revival school designed by local architect, Phillip Dean
Niels Petersen House (Maricopa County, Arizona)
Nielsen Farm (Lincoln County, Kansas)
Niles, Louville V., House (Middlesex County, Massachusetts)
Niles, Louville, House (Middlesex County, Massachusetts)
Nine Hearths (Warren County, Kentucky)
Ninth Avenue Historic District (Spokane County, Washington)
Ninth District Lighthouse Depot (Berrien County, Michigan)
Niotaze Methodist Episcopal Church (Chautauqua County, Kansas)
No. 12 School (Crawford County, Arkansas)
No. 206 Hall of Tell City Lodge IOOF (Perry County, Indiana)
Noah Edward Edgerton House (Johnston County, North Carolina)
Noah Moore House (Clarke County, Mississippi)
Noble Horse Barn (Owyhee County, Idaho)
Noblesville Milling Company Mill (Hamilton County, Indiana)
Former industrial building now converted to residential housing
Nolin Banking Company (Hardin County, Kentucky)
Nolte--Rooney House (Brewster County, Texas)
Nonnenmacher Bakery (Calhoun County, Alabama)
Nook, The (York County, Pennsylvania)
Norburn Terrace (Wake County, North Carolina)
Nordre Trefoldegheds Menigheds (Walsh County, North Dakota)
NORMAN (shipwreck) (Presque Isle County, Michigan)
Norman Brimhall House (Navajo County, Arizona)
Norman No. 1 Oil Well Site (Wilson County, Kansas)
Normandie Apartments (Douglas County, Nebraska)
North Abington Depot (Plymouth County, Massachusetts)
North Baltimore Town Hall (Wood County, Ohio)
North Brentwood Historic District (Prince George's County, Maryland)
North Broad Street Historic District (Essex County, New Jersey)
North Carolina Executive Mansion (Wake County, North Carolina)
North Elm Street Historic District (Hempstead County, Arkansas)
North Ghent (Norfolk, Virginia)
North Head Lighthouse (Pacific County, Washington)
65' Conical Lighthouse tower built in 1898
North Jay Grange Store (Franklin County, Maine)
North Long Branch School--Primary No. 3 (Monmouth County, New Jersey)
North Main Street Historic District (Davie County, North Carolina)
North Mankato Public School (Nicollet County, Minnesota)
North Pemberton Railroad Station (Burlington County, New Jersey)
North Plant City Residential District (Hillsborough County, Florida)
North Third Avenue Historic District (Chatham County, North Carolina)
North Tracy Avenue Historic District (Gallatin County, Montana)
Northampton Lumber Company Historic District (Northampton County, Virginia)
Northern District Police Station (Baltimore, Maryland)
Northern National Bank (Philadelphia County, Pennsylvania)
Northern Pacific Depot (Pine County, Minnesota)
Northern Pacific Office Building (Pierce County, Washington)
Northern Pacific Railway Depot (Cass County, North Dakota)
Northern Pacific Railway Depot (Morrison County, Minnesota)
Northrup House (Allen County, Kansas)
Northside United Methodist Church (Hamilton County, Ohio)
Norton House (Yuma County, Arizona)
Norwalk River Railroad Bridge (Fairfield County, Connecticut)
Norway Historic District (Oxford County, Maine)
Norwell Residence (Hamilton County, Ohio)
Norwood-TWL Building (Pike County, Mississippi)
Notre Dame de Chicago (Cook County, Illinois)
Notre Dame School (Bristol County, Massachusetts)
Noyes, J.A., House (Middlesex County, Massachusetts)
Nuckolls County Courthouse (Nuckolls County, Nebraska)
Nugent Home for Baptists (Philadelphia County, Pennsylvania)
O'Bannon Homestead (Cass County, Missouri)
O'Brien House (San Francisco County, California)
O'Brien, Richard, Three-Decker (Worcester County, Massachusetts)
O'Connor House (Pembina County, North Dakota)
O'Connor--Proctor Building (Victoria County, Texas)
O'Hara Waltham Dial Company (Middlesex County, Massachusetts)
O. B. Sims House (Ellis County, Texas)
O. L. and Josephine Morgan House (Jefferson County, Washington)
Oak Dell (Morris County, New Jersey)
Oak Grove Methodist Church (Meigs County, Tennessee)
Oak Knitting Company (Onondaga County, New York)
Oak Knoll (Middlesex County, Massachusetts)
Oak Ridge Military Academy Historic District (Guilford County, North Carolina)
Oak Square School (Suffolk County, Massachusetts)
Oak Street School (Androscoggin County, Maine)
Oakdale Public School (Allegheny County, Pennsylvania)
Oakdene (Staunton, Virginia)
Oakes Estate (Essex County, New Jersey)
Oakesdale City Hall (Whitman County, Washington)
Oakland (Hanover County, Virginia)
Oakland Block (Whatcom County, Washington)
Oakland Public School (Allegheny County, Pennsylvania)
Oaks Hotel (Wasco County, Oregon)
Italianate style two story brick hotel built in 1890
Oaks, The (Montgomery County, Virginia)
Oakwood Cemetery Chapel (Summit County, Ohio)
Ocean City Tenth Street Station (Cape May County, New Jersey)
Ochsner Hospital (La Plata County, Colorado)
Ocoee Christian Church (Orange County, Florida)
Oconomowoc Depot (Waukesha County, Wisconsin)
Oconto County Courthouse (Oconto County, Wisconsin)
Odd Fellows Building (Deuel County, South Dakota)
Odd Fellows Building (Daviess County, Kentucky)
Odd Fellows Hall (Baltimore, Maryland)
Odd Fellows Hall (Sheridan County, Wyoming)
Odd Fellows Hall (Wheeler County, Oregon)
Two story brick fraternal hall with ground level storefronts built in 1895
Odd Fellows' Home (Worcester County, Massachusetts)
demolished in 2014
Officers' Row Historic District (Kitsap County, Washington)
Ogdensburg Armory (St. Lawrence County, New York)
Ogle County Courthouse (Ogle County, Illinois)
Romanesque Revival, red brick structure designed by George O. Garnsey
Oglesby School (Davidson County, Tennessee)
Ogunquit Memorial Library (York County, Maine)
Ohio Street Bridge (Vanderburgh County, Indiana)
Through truss bridge over Pigeon Creek on Ohio Street
Oil Springs Methodist Church (Johnson County, Kentucky)
Old Akron Post Office (Summit County, Ohio)
Old Arkansas City High School (Cowley County, Kansas)
Old Ashland Post Office (Ashland County, Wisconsin)
Old Bag Factory (Elkhart County, Indiana)
Brick factory building and brick power house.