Rumford Public Library (Oxford County, Maine)
Rush County Courthouse (Rush County, Kansas)
Rush County Courthouse (Rush County, Indiana)
Rush-Miller House (Berkeley County, West Virginia)
Russell, The (Worcester County, Massachusetts)
S.J. Nissen Building (Forsyth County, North Carolina)
Sac County Courthouse (Sac County, Iowa)
Sackville House (Washington County, Pennsylvania)
Sacred Heart Catholic Church (Richmond County, Georgia)
Sacred Heart Church (Mercer County, New Jersey)
Sacred Heart Church (Montgomery County, Ohio)
Sacred Heart Church (Dawson County, Montana)
Sacred Heart of Jesus Church (Lawrence County, Tennessee)
Sacred Heart Orphanage (Pueblo County, Colorado)
Sacred Heart Parish Complex (San Francisco County, California)
Sagamore Mills No. 1 and No. 3 (Bristol County, Massachusetts)
Saint Anne's Hill Historic District (Montgomery County, Ohio)
Saint Anthony's Catholic Church (Brazos County, Texas)
Saint Benedict Joseph Labre Parish (Queens County, New York)
Saint Edward Seminary (King County, Washington)
Saint Joseph 1930 Hospital (Bernalillo County, New Mexico)
Saint Joseph Church (Clark County, Indiana)
Church built in 1881
Saint Joseph Parish Complex (Douglas County, Nebraska)
Saint Joseph School (Clark County, Indiana)
Catholic School built in 1892
Saint Joseph's Church and Complex (San Francisco County, California)
Saint Mary's Parish (Tehama County, California)
Saint Paul's Episcopal Church (Jefferson County, New York)
Salem Historic District (Harrison County, West Virginia)
Salem Methodist Episcopal Church (Columbiana County, Ohio)
Salem Presbyterian Church (Washington County, Tennessee)
Saline County Courthouse (Saline County, Arkansas)
Saline First Presbyterian Church (Washtenaw County, Michigan)
Salt Lake City and County Building (Salt Lake County, Utah)
Samuel Cupples House (St. Louis, Missouri)
Samuel S. Fleisher Art Memorial (Philadelphia County, Pennsylvania)
San Jose Downtown Historic District (Santa Clara County, California)
San Luis Obispo Carnegie Library (San Luis Obispo County, California)
Sand Beach Church (Cayuga County, New York)
Sandstone School (Pine County, Minnesota)
Sanford Commercial District (Seminole County, Florida)
Sanford Grammar School (Seminole County, Florida)
Sanger Brothers Complex (Dallas County, Texas)
Santa Fe Depot (Pottawatomie County, Oklahoma)
Saunders School (Douglas County, Nebraska)
Savoy (Marion County, Indiana)
Sayre Street School (Montgomery County, Alabama)
Scarlet Oaks (Hamilton County, Ohio)
Schiffman Building (Madison County, Alabama)
Schlee-Kemmler Building (Franklin County, Ohio)
Schley County Courthouse (Schley County, Georgia)
Schmidt Block (Scott County, Iowa)
Schmitz Block (Allen County, Indiana)
Schneider Triangle (Washington, District of Columbia)
Schnull-Rauch House (Marion County, Indiana)
Science Hall (Warren County, Iowa)
Scimitar Building (Shelby County, Tennessee)
Scott County Jail Complex (Scott County, Kentucky)
Scott-Vrooman House (McLean County, Illinois)
Scottish Rite Temple (Sedgwick County, Kansas)
Scottville School (Mason County, Michigan)
Scoville Memorial Library (Litchfield County, Connecticut)
Romanesque style library built in 1894 in Salisbury.
Scranton Armory (Lackawanna County, Pennsylvania)
Second Baptist Church (Boone County, Missouri)
Second Baptist Church (Monroe County, Indiana)
Second Presbyterian Church (St. Louis, Missouri)
Second Presbyterian Church (Shelby County, Tennessee)
Second Presbyterian Church (Franklin County, Ohio)
Second Presbyterian Church (Jefferson County, Alabama)
Security Savings Bank (Ashland County, Wisconsin)
Richardsonian Romanesque bank built in 1889 in brick and brownstone
Security State Bank (Wabaunsee County, Kansas)
Sedalia Commercial Historic District (Pettis County, Missouri)
Downtown area of Sedalia, Mo.
Seiberling Mansion (Howard County, Indiana)
Selle Gear Company (Summit County, Ohio)
Seneca Avenue East Historic District (Queens County, New York)
Seth Richards Commercial Block (Polk County, Iowa)
Seven Dolors Catholic Church (Riley County, Kansas)
Seventh Street School (Jefferson County, Kentucky)
Sever Hall, Harvard University (Middlesex County, Massachusetts)
Severs Block (Okmulgee County, Oklahoma)
Sevier County Courthouse (Sevier County, Tennessee)
Seymour Commercial Historic District (Jackson County, Indiana)
Downtown Commercial Area with a wide variety of styles
Shadyside Presbyterian Church (Allegheny County, Pennsylvania)
Sharon Lodge No. 28 IOOF (Wood County, West Virginia)
Shaw Junior High School (Washington, District of Columbia)
Sheedy Mansion (Denver County, Colorado)
Shelby County Courthouse (Shelby County, Texas)
Shelby County Courthouse (Shelby County, Iowa)
Shelden Avenue Historic District (Houghton County, Michigan)
Sheridan County Courthouse (Sheridan County, Nebraska)
Sherman Free Library (Essex County, New York)
Shoals Historic District (Martin County, Indiana)
Shoop Building (Racine County, Wisconsin)
Shove Memorial Chapel (El Paso County, Colorado)
Shrine of Our Lady of Sorrows (Montgomery County, Missouri)
Silas P. Smith Opera House (Doddridge County, West Virginia)
Silliman Memorial Presbyterian Church (Albany County, New York)
Simmons Hardware Company Warehouse (Woodbury County, Iowa)
Simpson Street School (Cumberland County, Pennsylvania)
Simpsonville Baptist Church (Greenville County, South Carolina)
Historic church in Simpsonville, SC
Sioux City Central High School (Woodbury County, Iowa)
Sioux County Courthouse (Sioux County, Iowa)
Sir Alfred T. Goshorn House (Hamilton County, Ohio)
Sixteenth Street Baptist Church (Jefferson County, Alabama)
Sixteenth Street Historic District (Washington, District of Columbia)
Sixth Church of Christ, Scientist (Milwaukee County, Wisconsin)
Skattaboe Block (Latah County, Idaho)
Skowhegan Fire Station (Somerset County, Maine)
Slater Building (Union County, Oregon)
Slater Library and Fanning Annex (New London County, Connecticut)
Sleeping Giant Tower (New Haven County, Connecticut)
Smith and Dow Block (Hillsborough County, New Hampshire)
Smith Warehouse (Durham County, North Carolina)
Smith's Building (Hampden County, Massachusetts)
Smith, Fleming, Warehouse (New York County, New York)
Smithfield Historic District (Isle of Wight County, Virginia)
Smithfield Street Bridge (Allegheny County, Pennsylvania)
Two-span lenticular through truss bridge over Monongahela River on Smithfield Street in Pittsburgh
Smithson and McKay Brothers Blocks (Multnomah County, Oregon)
Sohmer and Company Piano Factory (Queens County, New York)
Solomon Gans House (Pulaski County, Arkansas)
Somerset Hotel (Cook County, Illinois)
Somervell County Courthouse (Somervell County, Texas)
Son's Chapel (Washington County, Arkansas)
Soo Line Depot (Ashland County, Wisconsin)
Richardsonian Romanesque-style railroad depot, now housing local business.
South Congregational Church (Kings County, New York)
South Dakota School for the Deaf (Minnehaha County, South Dakota)
South Milwaukee Passenger Station (Milwaukee County, Wisconsin)
A depot built by the Chicago & Northwestern Railway.
South Side Market Building (Allegheny County, Pennsylvania)
South Side School (Henry County, Illinois)
South Street Seaport Historic District (New York County, New York)
South Unitarian (Worcester County, Massachusetts)
South Ward School (Howard County, Iowa)
Southbridge Town Hall (Worcester County, Massachusetts)
Southern District Police Station (Baltimore, Maryland)
Southern Pacific Depot (San Mateo County, California)
Southern Pacific Passenger Depot (Lane County, Oregon)
Southport Historic District (Fairfield County, Connecticut)
Speck District (St. Louis, Missouri)
Spencer Town Hall and Fire Station (Owen County, Indiana)
Spencerport Methodist Church (Monroe County, New York)
Sprague Building (Pierce County, Washington)
Spring Brook Cemetery (Bristol County, Massachusetts)
Spring Grove Cemetery (Medina County, Ohio)
Spring Grove Cemetery Chapel (Hamilton County, Ohio)
Springdale Cemetery (Peoria County, Illinois)
St Croix County Courthouse (St. Croix County, Wisconsin)
St. Adalbert Polish Catholic Church (Montgomery County, Ohio)
St. Albans Historic District (Franklin County, Vermont)
St. Albans Town Hall (Franklin County, Vermont)
St. Anne Church (Coos County, New Hampshire)
St. Anne's Church and Parish Complex (Bristol County, Massachusetts)
St. Anthony de Padua Parish School (Philadelphia County, Pennsylvania)
St. Anthony's Church and School (Boone County, Nebraska)
St. Anthony's Roman Catholic Church (Logan County, Colorado)
St. Anthony's Roman Catholic Church (New Castle County, Delaware)
St. Augustine Catholic Church and Cemetery (Washington County, Wisconsin)
St. Augustine's College Campus (Wake County, North Carolina)
St. Benedict's Church (Doniphan County, Kansas)
St. Bernard's Church (Summit County, Ohio)
St. Bonaventure Church Complex (Boone County, Nebraska)
St. Boniface Church (Spencer County, Indiana)
St. Boniface Church, Convent and Rectory (Whitman County, Washington)
St. Boniface Historic District (Woodbury County, Iowa)
St. Boniface Roman Catholic Church (Allegheny County, Pennsylvania)
St. Boniface Roman Catholic Church (Wayne County, Michigan)
St. Casimir Parish Historic District (St. Joseph County, Indiana)
St. Cecilia's Church and Convent (New York County, New York)
St. Charles Seminary and Chapel (Mercer County, Ohio)
Former seminary now serving as a retirement home for clergy and lay residents
St. Clement's Protestant Episcopal Church (Philadelphia County, Pennsylvania)
St. Cloud Commercial Historic District (Stearns County, Minnesota)