Very incomplete list!
- Saccharinity, His Royal
- Saddle, Wizard of the
- Safety, Mr. Highway
- Sage of Ashland, The
- Sage of Emporia, The
- Sage of Monticello
- Sage of Princeton, The
- Sage of Russellville, The
- Sage of the Ozarks
- Sage of Tishomingo, The
- Sage of Troy, The
- Sage of Wheatland, The
- Saint
- Salaciousness, Sultan of
- Sa'Leit'Sa' Kwina
- Salem, Merchant Prince of
- Salt, Old
- Salty
- Sam, Psycho
- Sam, Senator
- Sam, Silent
- Sam, Stars and Stripes
- Sam, Traveling
- Sam, Uncle
- Samm
- Samuel, Honest
- Samuel the Publican
- San Francisco, Mr.
- San Juan Hill, The Hero of
- Sandpaper, Admiral
- Sanford, Long Tom
- Sarah Barracuda
- Sarge
- Savior of South Carolina
- Savior of the Adirondacks
- Savior of the Union
- Scalito
- Schoharie, Old White Hoss of
- Schoolmaster, Hoosier
- Schoolmaster in Politics
- Schoolmaster, The Big Rapids
- Schools, Father of Arizona Public
- Scoop
- Scoots
- Scorecard
- Scotty
- Scrubby
- Searchlight
- Secession, The Orator of
- Seer of Wellesley Hills, The
- Senate, Lion of the
- Senate, The Conscience of the
- Senate, Wheel Horse of the
- Senator Alf
- Senator Bill
- Senator for the Southern Pacific Railroad, The
- Senator No
- Senator Oddball
- Senator Pothole
- Senator Sam
- Senator Sunday School
- Senator, The Cowboy
- Senator, The Kid
- Senator Welfare
- Seven Mule Barnum
- Shavey
- Sheepskin
- Shep, Mr.
- Shepherd, Boss
- Shepherd of the Loop
- Sheriff
- Sheriff, America's Toughest
- Sheriff, The
- Shifty Atherton
- Shifty Jim
- Shirley Mean
- Shirt sleeves
- Shooter
- Shooter, Square
- Shoots
- Shortface, Caelia
- Shorty
- Shreveport, Mr.
- Shrub
- Shug
- Sibby
- Signer, The
- Silence Dogood
- Silent Cal
- Silent Charlie
- Silent General, The
- Silent, Parker the
- Silent Sam
- Silent Soldier, The
- Silk Pony
- Silver Dick
- Silver Leg, Old
- Silver Tongued Grady
- Silver Tongued Orator, The
- Silver Tongued Sunbeam of the Painted Desert
- Simon
- Simon, Uncle
- Singer, The Psalm
- Singing Cop, The
- Singing Governor, The
- Singing Mayor
- Singing Mayor, The
- Sink and Swim, Old
- Sir James Jay
- Sirknight
- Sitting Bull
- Six, Big
- ska ja tah lo
- Skeet
- Skew
- Skip
- Skipper
- Skippy Lou
- Slats
- Sledgehammer, Brigham's
- Sleepy Joe
- Slick Willie
- Slim
- Slippery Jim
- Sludge King
- Sly Fox, The
- Small Paul Revere, The
- Smalley, Stuart
- Smiler
- Smiley
- Smirking Chimp, The
- Smoke, Old
- Smut, The King of
- Snooks
- Snorting Bull, The
- Soapy
- Socialist, The Millionaire
- Soldier Buck
- Soldier, Old
- Soldier, The Silent
- Son, The American
- Sonny
- Soul, Queen of
- Soup
- South Carolina, Savior of
- South, The Black Knight of the
- Southern Pacific Railroad, The Senator for the
- Southwest, Jimmy Walker of the
- Spagg, Jim
- Sparky
- Spec
- Speedy
- Sphinx of Jersey City
- Spike
- Spikehorn
- Spiro T. Eggplant
- Spunky
- Spymaster
- Square Shooter
- Squibb
- Squire of Haw River, The
- Squirmin' Herman
- Stag
- Stan The Man
- Star from Georgia, The Little Pale
- Star, The Lone
- Starlight
- Stars and Stripes Sam
- States Rights, The Hercules of
- Statesman, Christian
- Statesman, The Christian
- Steamroller
- Stedy
- Steel Magnolia, The
- Stephen, Uncle
- Steve, Big
- Stevedore, The Millionaire
- Stone Face, The Great
- Stoneface, Old
- Stonehammer, Old
- Stonewall Loeb
- Stormy Petrel, The
- Straddle, Old
- Strap Hanger, The Millionaire
- Straw Hat, Old
- Street
- Stripes Sam, Stars and
- Stripling, The
- Stuart Smalley
- Stuart X
- Stump, Napoleon of the
- Subsidy Pom
- Subway Vigilante
- Suds
- Suey
- Sufi Abdul Hamid, Bishop Amiru Al Mu Minim
- Sugar King of Hawaii, The
- Sugar Trust, Friend of the
- Sugarbear
- Sultan of Salaciousness
- Sunbeam of the Painted Desert, Silver Tongued
- Sundad
- Sundance
- Sunday School, Senator
- Sunny Jim
- Sunset Cox
- Sunshine
- Sunshine Bob
- Super Cop, The
- Superbooty
- Superchief
- Superman
- Supremo, El
- Surry, Duke of
- Swamp Fox
- Swede
- Swede, The Galloping
- Sweetheart, America's
- Swet, Old
- Swim, Old Sink and
- Swoonatra
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