- Sagel
 - Also Sagell, Saguel, Sagle, Zagel, Sachel, and Zachel. - Sammon
- Includes family tree, pictures, and searchable database.
- Sanderson
- Also offers information on Warburton, McCann, Pawson, and Malton.
- Sangowawa
- Sapey
- Sapp
- Beginning with Henry Sapp (1775-1853) and his wife, Mary of Madison Co., Florida.
- Sarrett
- Histories and photo albums of the Sarrett, Carlisle, Pittard, and Thompson families.
- Satterlee / Satterliegh / Satterley
- Saunders (1)
- Scaife Study Group
- Founded in 1997 this group gathers to research Scaifes, Skaifes, and other variant spellings of the name.
- Schiavon
- Also Favres and Renauds.
- Schmidt / Van Vorst / Van Loon
- Also Frank, Watkins, Hallam, Williams, and Flaherty.
- Schmitt (2)
- Schooley
- Schoonveld
- Also in Dutch.
- Schrift / Shrift
- Uniting the families from around the world.
- Schryver
- Listing of past and present Schryvers, Scrivers, Shrivers, Schrivers, de Schryvers, etc..
- Schürch
- Dedicated to the heritage of the Schürch name including Shirk, Sherk, Sherrick, Sharick, Schirch... Publishes a newsletter and holds a biennial reunion.
- Schulz Family Genealogy
- Dedicated to the research of the Schulz, Kiss, Schutz, Kirner, Strege, and Wagenknecht trees.
- Schumacher (1)
- Schwamb
- Descendents of Johann Ernst Schwamb and Anna Marie Gabel, who emigrated from Kongerheim, Germany, to Richfield, Wisconsin, in 1855.
- Schwartz (1)
- Scot
- Home of the Clan Scott of California Society.
- Scott (4)
 Scotting / Scotton
- Providing information about the descendants of many branches of the families of East Anglia, England.- Scroope
- Features family ancestry and history.
- Seaman Family History Pages
- Provides the history and genealogy of the descendants of Caleb Seaman of Ontario, Canada.
- Segal
- Seguin (1)
- Seidenstricker
- Also including Silknitter genealogy and family history.
- Selaquet
- Self (3)
- Shackelford
- Searchable database. Other family names include Gwinn and McDonald.
- Sharp (1)
- Shaules
- Descendants of Shaules, Kerrigan, Samse, Patten, Dodge, Millar, Witcher, Medearis, and their offshoots.
- Shawkey
- List of Shawkeys in the U.S., a family tree, and information about a upcoming family reunion.
- Sheedy
- Genealogy of Chamberlin, Daman, Bennett, Stevens, Catlett, Schabowski, Pendleton, Gubbins, Taylor and others.
- Shevlin
- History and family tree of the surname.
- Shinnick
- Presented to the living relatives of Michael & Elizabeth (Forest) Shinnick.
- Shipman / Kiser
- Including the surnames: Babb, Smith, Burleson, Matson, Chappell, Cothern, Pancake, Karnes, Nichols and Tubbs.
- Shirley
- Genealogy of the ancient family. Includes pages for England, America, and Australia.
- Shuflin
- Variations: Shufflin, Shefflin, Shevlin, and Shevelin.
- Sides
- Descendants of Nelson Sides of NC, and other Sides links.
- Sidney
- Offers geographical, historical, and genealogical information about all things Sidney and Sydney, including ancestral home Penshurst Place.
- Silvestri
- Includes information on the descendants of Giovanni Silvestri.
- Simonds
- Also: Lewis, Massey, Rials, Stanley, Stockman, Thomas, and Trimble.
- Skaja
- With family trees and photographs.
- Slater
- Dedicated to the families and descendents of Joseph and Helen Slater from Portknockie, Scotland.
- Smith (1)
 Smyth
- Two family trees of the family in Kilcornan, County Limerick, Ireland.- Snodgrass
- Warden, Killian, Lisowski, Beaulieu, Boucher, Gwin, Collins, Eagle, Sigsworth, Whaley, and many more.
- Sole
- A family history society researching Sole, Solley, Sewell, Saul and allied surnames.
- Somerville
- Providing information on the surname of Somerville.
- Sorensen (1)
- Spafford
- Alternative spellings include Spofford, Spofforth, Spafard or Spaford.
- Spearing
- Includes family tree and pictures.
- Spiers
- Splawn
- Reference site for the surname.
- Sprague
- Sprehn / Heasley
- Sprehn genealogy beginning in the mid-1800s and Heasley genealogy beginning in the mid-1600s.
- Springford
- Also Springbett.
- Standridge / Maddox
- Includes a comprehensive list of Texas Standridge births and deaths.
- Staniforth
- Family history.
- Stanley / Matthews
- From Ireland to the U.S. and related surnames: Matthews, Warner, Falvey, and Reed.
- Stanphill
- Short history of one branch of the family tree.
- Stansfield
- Ancestry and family history orignating from Calderdale, England.
- Statler
- Family genealogy database.
- Stelloh
- Stenlake
- If you or anyone you know has this surname, please come to this page.
- Stevens / Simpson
- Explore these genealogy trees.
- Stickels / Stickle
- Stiddem
- For the descendants of Timen Stiddem (later anglicized to Timothy Stidham) from Sweden in the 17th century to New Sweden (now Wilmington) Delaware.
- Stillman (1)
- Stout
- Family history and related information including newspaper, books, and other online resources.
- Strawn
- Collection of surnames & queries including: ancestral lines, "The Researcher's Page", research services available, links to home pages.
- Strecker
- Genealogy of the Strecker family, descended from John Strecker (b. 1804) in Rielingshausen, Germany.
- Street (1)
- Strickland (1)
- Strickler
- Stromquist
- Dedicated to the genealogy and history of the Stromquist family, and the collateral lines of Jonsson, Laubach, Lindstrom, Lorenz and Paulseen.
- Strouse House
- Also including histories on: Ellis, Glass, Martin, Hendee, Harmison, Ellsworth, Faulkner, Layng, McCann, Olin, Spencer, Pierce, Card, Cunningham, McGillivray, Bailey, Harmison, Egan, Eagan, Matthews, and more.
- Strout / Howey
- Including: Lord, Bean, Kikly, and Kimball.
- Strutton
- Includes family database, queries page, surname researchers list, and more.
- Stubbs / Uplinger (1)
- Studebaker
- Specialising in the family which became famous for its wagons and cars.
- Sturdivant
- Contains genealogy research on the descendants of John Sturdivant who lived in Charles City County, VA in the 1600¿s.
- Suggitt
- Also Scaife, Smith, Wood, and more.
- Sullivan (2)
- Sundheim (2)
- Surname Finder
- Online family tree links and resources from Genealogy Today.
- Surname Springboard
- Purpose of this page is to compile in one area all known Gedcom "Indexed" links on the web.
- SurnameWeb
- An index to surname resource centres, and personal genealogy pages as well as other surname resources.
- Sutton
- Genealogical newsletter, research, and more.
- Swafford
- Containing forums, reunion information, announcements, and more.
- Swain / Howe
- Including the surnames: Grover, Mitchell, Libby, Trefethen, Davis, Hallowell and other related families from the state of Maine.
- Swarbrick
- Ancestors of John David Swarbrick.
- Swatek
- Also Richter.
- Swayne
- Hosts an online transcription of Chester County Swaynes by Norman Walton Swayne.
- Sweeney
- With historical clan information, reunion announcements, information about the restoration of Doe Castle, and more.
- Swinehart
- Early NY & NJ Dutch families with some later German arrivals: Joralemon, Van Eyderstyn, Wessels, Cadmus, Cuyper, Spier, Pier, etc.
- Szumski / Lloyd
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