Solomon A. Alt House (Shawnee County, Kansas)
Solomon and Henry Weil Houses (Wayne County, North Carolina)
Solomon and Kate Williams Jr. House (Warren County, North Carolina)
Solomon Arter House (Carroll County, Maryland)
Solomon Fowler Mansion (Elkhart County, Indiana)
Solomon Gans House (Pulaski County, Arkansas)
Solomon Gilman Comstock House (Clay County, Minnesota)
Solomon House (Philadelphia County, Pennsylvania)
Solomon Juneau Summer Home (Washington County, Wisconsin)
Greek Revival Home
Solomon Kimball House (Lake County, Ohio)
Solomon S. Curry House (Gogebic County, Michigan)
Solomon Thomas House (Woodford County, Kentucky)
Solomon Walters House (Brookings County, South Dakota)
Solomon Weaver House (Yates County, New York)
Solomon-Curd House (Bibb County, Georgia)
Solomon-Smith-Martin House (Bibb County, Georgia)
Somers Mansion (Atlantic County, New Jersey)
Somerville (Kent County, Delaware)
Sommerer House (St. Joseph County, Indiana)
Sommerville-Kearney House (Orleans Parish, Louisiana)
Sonnenberg Gardens (Ontario County, New York)
Sonoma Plaza (Sonoma County, California)
Soper--Behymer Ranch (Butte County, South Dakota)
Sophenia Ish Baker House (Jackson County, Oregon)
Sophia's Dairy (Harford County, Maryland)
Sophie May House (Somerset County, Maine)
Sorapuru House (St. John the Baptist Parish, Louisiana)
Soren Hanson House (Cache County, Utah)
Soren Simonsen House (Sevier County, Utah)
Sorenson House (King County, Washington)
Sorenson Residence (Rosebud County, Montana)
Sosa--Carrillo--Fremont House (Pima County, Arizona)
Sotcher Farmhouse (Bucks County, Pennsylvania)
Sotterley (St. Mary's County, Maryland)
Soule, Lawrence, House (Middlesex County, Massachusetts)
Sousa, John Philip, House (Nassau County, New York)
South Brick House (Wake County, North Carolina)
South Broad Street Row (Iredell County, North Carolina)
South Carolina Governor's Mansion (Richland County, South Carolina)
South Hamilton Street Row (Dutchess County, New York)
South of Campus Neighborhood (Butte County, California)
South Park Neighborhood (Clark County, Kentucky)
South Pass City (Fremont County, Wyoming)
South Prescott Townsite (Yavapai County, Arizona)
South Spring Ranch (Chaves County, New Mexico)
South Street Seaport (New York County, New York)
South Trade Street Houses (Forsyth County, North Carolina)
Southdown Plantation (Terrebonne Parish, Louisiana)
Souther, John, House (Middlesex County, Massachusetts)
Southerland-Burnette House (Wayne County, North Carolina)
Southgate House (Pendleton County, Kentucky)
Southgate-Lewis House (Travis County, Texas)
Southgate-Parker-Maddux House (Campbell County, Kentucky)
Southwick House (Essex County, Massachusetts)
Southwick, Elisha, House (Worcester County, Massachusetts)
Southwick, Israel, House (Worcester County, Massachusetts)
Southwick--Harmon House (Sarasota County, Florida)
Southworth House (Cuyahoga County, Ohio)
Southworth House (Tompkins County, New York)
Southworth House (Leflore County, Mississippi)
Spade Ranch (Unspecified county, Nebraska)
Spafford House (Wood County, Ohio)
Spafford House (Flathead County, Montana)
Spalding-Gunn House (Lewis and Clark County, Montana)
Spangler--Wilbur House (Maricopa County, Arizona)
Spanish House, The (Hartford County, Connecticut)
Spanish Town (East Baton Rouge Parish, Louisiana)
Sparrow House (Cumberland County, Maine)
Sparta Rock House (White County, Tennessee)
Spaulding House (Somerset County, Maine)
Spaulding, Joseph, House (Providence County, Rhode Island)
Spaulding, Zeb, House (Middlesex County, Massachusetts)
Spaulding-Olive House (McCurtain County, Oklahoma)
Spear, Seth, Homestead (Norfolk County, Massachusetts)
Spearfish Fisheries Center (Lawrence County, South Dakota)
Spears House (Faulkner County, Arkansas)
Spears House (Cabarrus County, North Carolina)
Spears--Craig House (Boyle County, Kentucky)
Speedwell Forge Mansion (Lancaster County, Pennsylvania)
Speight House and Cotton Gin (Chowan County, North Carolina)
Speight-Bynum House (Greene County, North Carolina)
Speigle House (Marion County, Missouri)
Spell House (De Soto Parish, Louisiana)
Spell House (Brevard County, Florida)
Spence's Point (Westmoreland County, Virginia)
Spencer Boyd Street Houses (Young County, Texas)
Spencer Buford House (Williamson County, Tennessee)
Spencer Harris House (Pitt County, North Carolina)
Spencer House (Hartford County, Connecticut)
Spencer House (Lee County, South Carolina)
Spencer House (Livingston County, New York)
Spencer House (Onondaga County, New York)
Spencer Rock House (Clark County, Idaho)
Spencer's Landing (Washington County, Ohio)
Spencer-Peirce-Little House (Essex County, Massachusetts)
Sperry--Smith House (White County, Tennessee)
Spicer--Millard House (Yates County, New York)
Spiegelberg House (Santa Fe County, New Mexico)
Spies--Robinson House (Multnomah County, Oregon)
Spieth Houses (Gallatin County, Montana)
Spinks Plantation (Pike County, Mississippi)
Spinner House (Bucks County, Pennsylvania)
Spirit House (Madison County, New York)
Spirit Lake Massacre Log Cabin (Dickinson County, Iowa)
Spite House (Knox County, Maine)
Spofford-Barnes House (Essex County, Massachusetts)
Spotswood House (Mendocino County, California)
Sprague House (Lorain County, Ohio)
Sprague House (Essex County, Massachusetts)
Sprague Street Houses (Caddo Parish, Louisiana)
Sprague, David, House (Providence County, Rhode Island)
Sprague, Elias, House (Tolland County, Connecticut)
Sprague, Gov. William, Mansion (Providence County, Rhode Island)
Sprague--Deaver House (Knox County, Ohio)
Sprague-Marshall-Bowie House (Multnomah County, Oregon)
Spratt--Allen--Aull House (Lafayette County, Missouri)
Sprechers Mill House (Washington County, Maryland)
Spreckels Mansion (San Francisco County, California)
French Baroque style mansion built in 1913
Spring Brook House (Morris County, New Jersey)
Spring Dale (Pulaski County, Virginia)
Spring Garden-John Leavell (Garrard County, Kentucky)
Spring Green (Hanover County, Virginia)
Spring Grove (Westmoreland County, Virginia)
Spring Grove Farm and Distillery (Franklin County, Pennsylvania)
Spring Grove Forge Mansion (Lancaster County, Pennsylvania)
Spring Hill (New Kent County, Virginia)
Spring Hill (Stark County, Ohio)
Spring Hill (Oldham County, Kentucky)
Spring Hill (Wake County, North Carolina)
Spring Hill (Albemarle County, Virginia)
Spring Hill (Thomas Lillard House) (Boyle County, Kentucky)
Spring Hill Ranch (Chase County, Kansas)
Spring Park Inn (Greenville County, South Carolina)
Spring Place (Sullivan County, Tennessee)
Spring Station (Jefferson County, Kentucky)
Spring Villa (Lee County, Alabama)
A historic Carpenter Gothic plantation house on the outskirts of Opelika, Alabama.
Springbank (New London County, Connecticut)
Springbank (Nassau County, New York)
Springdale (Goochland County, Virginia)
Springdale (Rockbridge County, Virginia)
Springdale (Frederick County, Virginia)
Springdale (Seneca County, Ohio)
Springdale Mill Complex (Frederick County, Virginia)
Springer--Cranston House (New Castle County, Delaware)
Springfield (Hanover County, Virginia)
Springfield Brick House (Hampshire County, West Virginia)
Springfield Plantation (Jefferson County, Mississippi)
Springfield Plantation House (York County, South Carolina)
Springhill (Clark County, Kentucky)
Springland (Washington, District of Columbia)
Springside Park (Berkshire County, Massachusetts)
Springstead (Iron County, Wisconsin)
Springwood Manor (Albany County, New York)
Sproul Homestead (Lincoln County, Maine)
Spur House (Cheshire County, New Hampshire)
Spurgeon House (Davidson County, North Carolina)
Spurr, Eliphalet, House (Norfolk County, Massachusetts)
Spurr, John, House (Worcester County, Massachusetts)
Spye Park (Charles County, Maryland)
Squaw Peak Inn (Maricopa County, Arizona)
Squire Tarbox House (Lincoln County, Maine)
Squire Turner House (Madison County, Kentucky)
Squire's Rest (Shelby County, Tennessee)
Squires-Tourtellot House (Boulder County, Colorado)
Squirrels, The (Orange County, New York)
Sr. Trujillo Fernando, House (Rio Arriba County, New Mexico)
Sroufe House (Mason County, Kentucky)
St. Catharine (Charles County, Maryland)
St. Elmo (Muscogee County, Georgia)
St. Emma (Ascension Parish, Louisiana)
St. Francois County Jail and Sheriff's Residence (St. Francois County, Missouri)
St. Gaudens, Louis, House and Studio (Sullivan County, New Hampshire)
St. George Plantation House (Terrebonne Parish, Louisiana)
St. Giles (Wicomico County, Maryland)
St. John the Baptist Roman Catholic Church (Campbell County, Kentucky)
St. John's Parsonage (Union County, New Jersey)
St. Joseph Plantation House (St. James Parish, Louisiana)
St. Julien (Spotsylvania County, Virginia)
St. Julien House (Lafayette Parish, Louisiana)
St. Julien Plantation (Orangeburg County, South Carolina)
St. Louis Plantation (Iberville Parish, Louisiana)
St. Luke's Hospital (Scott County, Iowa)
St. Luke's Hospital (Sanders County, Montana)
Former hospital built in 1910 converted to residence in 1927
St. Mary's By the River (Jackson County, Mississippi)
St. Mary's Rectory (Johnson County, Iowa)
St. Maurice Plantation (Winn Parish, Louisiana)
St. Patrick's Convent (Silver Bow County, Montana)
St. Patrick's Rectory (Silver Bow County, Montana)
St. Paul's Bottoms (Caddo Parish, Louisiana)
St. Richard's Manor (St. Mary's County, Maryland)
St. Scholastica Rectory (Sanborn County, South Dakota)