Old Main, Augustana Academy (Lincoln County, South Dakota)
Old Main, Augustana College (Rock Island County, Illinois)
A dolomite-clad building in the Renaissance Revival style from the 19th Century
Old Main, Bethany College (Brooke County, West Virginia)
Old Main, California State College (Washington County, Pennsylvania)
Old Main, Dr. Martin Luther College (Brown County, Minnesota)
Old Main, Knox College (Knox County, Illinois)
Old Main, Macalester College (Ramsey County, Minnesota)
Old Main, Mankato State Teachers College (Blue Earth County, Minnesota)
Old Main, Marshall University (Cabell County, West Virginia)
Administration building for Marshall University in Huntington, WV
Old Main, Nebraska Wesleyan University (Lancaster County, Nebraska)
Old Main, Pembroke State University (Robeson County, North Carolina)
Old Main, St. Olaf College (Rice County, Minnesota)
Old Main, Suomi College (Houghton County, Michigan)
Old Main, University of Arizona (Pima County, Arizona)
Old Main, University of Arkansas (Washington County, Arkansas)
Old Main, Utah State University (Cache County, Utah)
Old Main, Western Washington State College (Whatcom County, Washington)
Old Main--Gustavus Adolphus College (Nicollet County, Minnesota)
Old Maxwell Hutterite Colony (Hutchinson County, South Dakota)
Old McKinley High School (Stark County, Ohio)
Old Medford High School (Middlesex County, Massachusetts)
Old Medical College Building (Richmond County, Georgia)
Old Medical College Historical Area (Spalding County, Georgia)
Old Middletown High School (Middlesex County, Connecticut)
Old Mission House (Yukon-Koyukuk Census Area, Alaska)
Old Monroe School House (Sussex County, New Jersey)
Old Morrison, Transylvania College (Fayette County, Kentucky)
Old Nacogdoches University Building (Nacogdoches County, Texas)
Old Nazareth Academy (Victoria County, Texas)
Old New Bloomington School (Marion County, Ohio)
Stone trimmed brick school
Old Newark Comprehensive School (New Castle County, Delaware)
Old Normal School Building (Calloway County, Kentucky)
Old North Tower, Central State College (Oklahoma County, Oklahoma)
Old Ocean Springs High School (Jackson County, Mississippi)
Old Ohio Union (Franklin County, Ohio)
Old Palm Beach Junior College Building (Palm Beach County, Florida)
Old Pathology Building (Marion County, Indiana)
Old Portlock School #5 (Chesapeake, Virginia)
Old Presbyterian Theological Seminary (Jefferson County, Kentucky)
Old Queen's (Middlesex County, New Jersey)
Old Rainey Road Schoolhouse (Anderson County, South Carolina)
Old schoolhouse ruins near Starr, SC
Old Redmond Schoolhouse (King County, Washington)
Old Richmond Schoolhouse and Gymnasium (Forsyth County, North Carolina)
Old Riverside Hutterite Colony (Beadle County, South Dakota)
Old Rock School (Iowa County, Wisconsin)
Old Rock School (Crawford County, Wisconsin)
Old Rockville High School and East School (Tolland County, Connecticut)
Old Russet School (Johnston County, Oklahoma)
Abandoned School Building
Old San Antonio Hospital (San Bernardino County, California)
Old School House (Hillsborough County, Florida)
Old School Privy (Ottawa County, Ohio)
Old Schoolhouse (Burlington County, New Jersey)
Old Schoolhouse (York County, Maine)
Old Seminary Building (Gwinnett County, Georgia)
Old Skedee High School (Pawnee County, Oklahoma)
Single-story red brick school
Old Springdale High School (Washington County, Arkansas)
Old St. Mary's School (Washington County, Ohio)
Old State Capitol (Baldwin County, Georgia)
Old Sutton High School (Braxton County, West Virginia)
Old Troy Hospital (Rensselaer County, New York)
Old Tubac Schoolhouse (Santa Cruz County, Arizona)
Old Union School (Morrow County, Ohio)
Old Union School (Coshocton County, Ohio)
Old Union School (Randolph County, Arkansas)
Old Union School Building (Erie County, Ohio)
Old University Library (Lancaster County, Nebraska)
Old Ursuline Convent (Orleans Parish, Louisiana)
Old Weber School (San Joaquin County, California)
Old Wesson Public School Building (Copiah County, Mississippi)
Old West Haven High School (New Haven County, Connecticut)
Old West, Dickinson College (Cumberland County, Pennsylvania)
Olga School (Lee County, Florida)
Olive Civic Center (Orange County, California)
Olive Township District No. 1 School (Ottawa County, Michigan)
Oliver School (Clark County, Kentucky)
Olmsted Station Powerhouse (Utah County, Utah)
Olney Elementary School (Philadelphia County, Pennsylvania)
Olney High School (Philadelphia County, Pennsylvania)
Olympia Mill School (Richland County, South Carolina)
Olympia School (Martin County, Florida)
Omaha High School (Douglas County, Nebraska)
Omro High School, Annex and Webster Manual Training School (Winnebago County, Wisconsin)
Former school complex repurposed as assisted living for senior citizens
Oneida Stake Academy (Franklin County, Idaho)
Oquirrh School (Salt Lake County, Utah)
Oran District No. 22 Schoolhouse (Onondaga County, New York)
Orange City Colored School (Volusia County, Florida)
Orange High School (Orange County, Virginia)
Orange Park Elementary School (Clay County, Florida)
Orange Street School (Cumberland County, North Carolina)
Orange Union High School (Orange County, California)
Orchard House (Middlesex County, Massachusetts)
Oregon High School (Dane County, Wisconsin)
Oronoco School (Olmsted County, Minnesota)
Orr School (Miller County, Arkansas)
Orville Beach Memorial Manual Training School (Winnebago County, Wisconsin)
Former school repurposed as business center and office building
Osage Hills School (St. Louis County, Missouri)
Osborn Street School (Bristol County, Massachusetts)
Osborne School (Palm Beach County, Florida)
Osborne School (Erie County, Ohio)
Oscar W. Underwood House (Washington, District of Columbia)
Osceola Public School Building (St. Clair County, Missouri)
Osprey School (Sarasota County, Florida)
Ouachita Parish High School (Ouachita Parish, Louisiana)
Our Lady of Mercy High School (Hamilton County, Ohio)
Our Lady of the Angels Academy (Morrison County, Minnesota)
Our Lady of the Angels School (Bernalillo County, New Mexico)
Our Lady of the Assumption School (Lafayette Parish, Louisiana)
Our Lady of Victory Academy (Tarrant County, Texas)
Our Mother of Mercy School (Tarrant County, Texas)
Ourant's School (Harrison County, Ohio)
Out of Door School (Sarasota County, Florida)
Overackers Corners Schoolhouse (Yates County, New York)
Overbrook High School (Philadelphia County, Pennsylvania)
Overbrook School (Philadelphia County, Pennsylvania)
Overstreet Hall (Columbia County, Arkansas)
Overton Gymnasium (Clark County, Nevada)
Owen High School (Clark County, Wisconsin)
Oxford Female Institute (Butler County, Ohio)
P. K. Yonge Laboratory School, Old (Alachua County, Florida)
P. S. Dupont High School (New Castle County, Delaware)
Pahokee High School (Palm Beach County, Florida)
Paia School (Maui County, Hawaii)
Paint Lick School (Garrard County, Kentucky)
Paintsville High School (Johnson County, Kentucky)
Palestine High School (Anderson County, Texas)
Palmer Fire School (Mecklenburg County, North Carolina)
Palmer Hall (El Paso County, Colorado)
Palmer School (Essex County, Massachusetts)
Panola High School and Gymnasium (Latimer County, Oklahoma)
Pantego Academy (Beaufort County, North Carolina)
Panther Branch School (Wake County, North Carolina)
Paradise School (Newport County, Rhode Island)
Parents' and Children's Schoolhouse (Midland County, Michigan)
Paris Male Academy (Monroe County, Missouri)
Paris Public School (Bear Lake County, Idaho)
Park Addition School (Laramie County, Wyoming)
Park City High School (Summit County, Utah)
Park City Junior High School (Knox County, Tennessee)
Park Elementary School (Clay County, Minnesota)
Park House Hotel (Johnson County, Iowa)
Park Place School (Allegheny County, Pennsylvania)
Park Region Luther College (Otter Tail County, Minnesota)
Park School (Douglas County, Nebraska)
Parker High School Auditorium (Greenville County, South Carolina)
Parker School (Polk County, Oregon)
Parkesburg School (Chester County, Pennsylvania)
Parkland Junior High School (Jefferson County, Kentucky)
Parks School (Scott County, Arkansas)
Parkside Elementary School (Kay County, Oklahoma)
Parmenter Memorial Hall (Douglas County, Kansas)
Parnell Hall (Pulaski County, Arkansas)
Parsonsfield Seminary (York County, Maine)
Pascagoula High School, Old (Jackson County, Mississippi)
Pascoag Grammar School (Providence County, Rhode Island)
Pass Creek School (Gallatin County, Montana)
Pataskala Elementary School (Licking County, Ohio)
Patten Consolidated School (Aurora County, South Dakota)
Patterson Branch Library (Stanislaus County, California)
Paul Hall, Muskingum College (Muskingum County, Ohio)
Paul Lawrence Dunbar School (Philadelphia County, Pennsylvania)
Paul Lawrence Dunbar School (Lee County, Florida)
Paupack School (Pike County, Pennsylvania)
Paw Paw Building (Cecil County, Maryland)
Pawtucket West High School (Providence County, Rhode Island)
Paxton First Schoolhouse (Ford County, Illinois)
Pea Ridge School Building (Marion County, Arkansas)
Peabody College for Teachers (Davidson County, Tennessee)
Peabody Elementary School (Shelby County, Tennessee)
Peabody Hall (Alachua County, Florida)
Peabody High School (Gibson County, Tennessee)
Peabody School (Dodge County, Georgia)
Peabody School (Essex County, Massachusetts)
Peace College Main Building (Wake County, North Carolina)
Peake High School (Clark County, Arkansas)
Pearl High School (Davidson County, Tennessee)
Pearl Spann Elementary School (Hinds County, Mississippi)
Pearl Street School (Middlesex County, Massachusetts)
Pearl Street Schoolhouse (Ulster County, New York)
Pease Auditorium (Washtenaw County, Michigan)
Pecan Creek School (Gillespie County, Texas)
Pecan Grove School (Cape Girardeau County, Missouri)
Peeples Valley School (Yavapai County, Arizona)
Peirce School (Middlesex County, Massachusetts)
Pembroke High School, Former (Robeson County, North Carolina)
Penn Treaty Junior High School (Philadelphia County, Pennsylvania)
Pennell Institute (Cumberland County, Maine)
Pennsylvania Institute for the Deaf and Dumb (Philadelphia County, Pennsylvania)
Pentacrest (Johnson County, Iowa)
Peoria Indian School (Ottawa County, Oklahoma)
Percy District School House, (Former) (Sagadahoc County, Maine)
Perkins Hall of Administration (Dallas County, Texas)