Here's a list of short fiction, poetry and articles written by Stephen King, followed by one source of the piece. Most of the stuff subsequently published in his collections are not listed and I won't even begin to try to list every source of each piece...
Short Fiction "Before the Play" Whispers #17/18 Aug 82 "The Blue Air Compressor" Onan Jan 71; Heavy Metal Jul 81 "The Cat From Hell" The Year's Finest Fantasy ed. by Terry Carr "Chattery Teeth" Cemetary Dance Fall 1992 "The Crate" Gallery Jul 79 "Crouch End" New Tales of the Cthulhu Mythos ed. by Ramsey Campbell 80 "Dedication" Night Visions: The Skin Trade ed. by Douglas Winter 88 "The Doctor's Case" The New Adventures of Sherlock Holmes ed. by Martin Harry Greenburg and Carol-Lynn Rossel Waugh 87 "Dolan's Cadillac" Castle Rock #2-6 85 "The End of the Whole Mess" Omni Oct 86 "The Fifth Quarter" Twilight Zone Feb 86 "The Glass Floor" Startling Mystery Stories Fall 67 "The Gunslinger" Fantasy and Science Fiction Oct 78 "The Gunslinger and the Dark Man" Fantasy and Science Fiction Nov 81 "Heroes for Hope: Starring the X-Men #1" 2 pages w/Berni Wrightson illustrating "Home Delivery" Book of the Dead ed. by John Skipp and Craig Spector 89 "In a Half World of Terror" Stories of Suspense #2 66 "It Grows on You" Marshroots 75 "The Killer" Famous Monsters of Filmland #202 Spring '94 "The Lawnmower Man" Bizarre Adventures #29 Dec 81 "Lunch at the Gotham Cafe" Dark Love ed. by Nancy A. Collins, Edward E. Kramer, and Martin H. Greenberg 95 "The Man in the Black Suit" New Yorker Oct 31, 94 "The Moving Finger" Fantasy and Science Fiction Dec 90 "The Night Flyer" Prime Evil ed. by Douglas Winter 88 "The Night of the Tiger" Fantasy and Science Fiction Feb 78 "The Oracle and the Mountains" Fantasy and Science Fiction Feb 81 "The Plant" 82, 83, 85 "Popsy" Masques II ed. by J.N. Williamson 87; Masques #2 "The Raft" Twilight Zone Jun 83 "Rainy Season" Midnight Graffiti #3 Spring 89 "The Reploids" Night Visions: The Skin Trade ed. by Douglas Winter 88 "The Revelations of 'Becka Paulson" Rolling Stone Jul 19/Aug 84 "Skybar" The Do-It-Yourself-Bestseller ed. by Tom Silberkleit and Jerry Biederman 82 "The Slow Mutants" Fantasy and Science Fiction Jul 81 "Sneakers" Night Visions: The Skin Trade ed. by Douglas Winter 88 "Suffer the Little Children" Cavalier Feb 72 "The Way Station" Fantasy and Science Fiction Apr 80 "The Word Processor" Playboy Jan 83 "The Weeds" Cavalier May 76 "You Know They Got a Hell of a Band" Shock Rock ed. by Jeff Gelb 92 Poetry "The Dark Man" Moth ed. by George MacLeod and Bruce Holsapple 70 "Donovan's Brain" Moth ed. by George MacLeod and Bruce Holsapple 70 "Harrison State Park '68" Ubris Fall 68 "Silence" Moth ed. by George MacLeod and Bruce Holsapple 70 Untitled: "In the key chords of dawn..." Onan 71 Non Fiction "All-American Love Story" The Washington Post Bookworld Jul 6, 86 "Author's Note" Masters of Darkness III ed. by Dennis Etchison 91 "Between Rock and a Soft Place" Playboy Jan 82 "Blood and Thunder in Concord" New York Times Book Review Sep 10, 95 "Books: Critic Critique" Adelina Jul 80 "Books: Love Those Long Novels" Adelina Nov 80 "Books: The Sixties Zone" Adelina Jun 80 "Books: Two for Terror" Adelina Aug 80 "The Camus of Crime" USA Today May 23, 86 "The Cannibal and the Cop" The Washington Post Bookworld Nov 1, 81 "Cat From Hell" Castle Rock Jun 85 "Dear Walden People" The Stephen King Companion ed. by George Beahm 89 (rep. from Book Notes Aug 83) "Diamonds are Forever" Life May 94 "Digging the Boogens" Twilight Zone Jul 82 "Dr. Seuss and the Two Faces of Fantasy" Fantasy Review #68 "Don't Be Cruel" TV Guide Apr 30, 83 "The Dreaded X" Castle Rock Dec 86/Jan 87 "The Dreaded X" Gauntlet 90 "Dream Team: Just Another Horror Show" The New York Times Aug 9, 92 "86 Was Just the Ticket" Boston Globe Oct 6, 86 "Entering the Rock Zone, Or, How I Happened to Marry a Radio Station From Outer Space" Castle Rock Oct 87 "'Ever Et Raw Meat' and Other Weird Questions" Twilight Zone Jan 88 "Everything You Need to Know About Writing Successfully - in Ten Minutes" The Writer Jul 86 "The Evil Dead: Why You Haven't Seen it Yet...and Why You Ought to" Twilight Zone Nov 82 "Famous First Words: Well Begun is Half Done" The New York Times Book Review Jun 2, 85 "Favorite Films" The Washington Post Jun 24, 82 "Fie on Fantasy" Castle Rock Jan 86 "Fire & Ice Cream" Mademoiselle Nov 85 "For the Birds" Bred Any Good Rooks Lately? 86 "Foreword" Silver Bullet 85 "Foreword" Stalking the Nightmare by Harlan Ellison 82 "Foreword" Tales From the Nightside by Charles Grant 81 "The Fright Report" Oui Jan 78 "Ghostmaster General" Castle Rock Oct 85 "The Gospel According to John Irving" The Washington Post Bookworld May 5, 89? "Head Down" The New Yorker Apr 16, 90 "Hello Mary Lou, Goodbye Rick" Spin Apr 86 "High School Horrors" Castle Rock Feb 86 "The Horror Market Writer and the Ten Bears" Writer's Digest Nov 73 "Horrors!" TV Guide Oct 30, 82 "The Horrors of '79" Rolling Stone Dec 79-Jan 80 "Houston: So Normal It Was Weird" The New York Times Aug 23, 92 "How I Created Golden Years...and Spooked Dozens of TV Executives" Entertainment Weekly Aug 2, 91 "How IT Happened" Book of the Month Club News "How IT Happened" The Writer Apr 87 "How to Scare a Woman to Death" Murderess Ink ed. by Dilys Winn 79 "The Ideal, Genuine Writer: A Forenote" The Ideal, Genuine Man by Don Robertson 87 "Imagery and the Third Eye" The Writer Oct 80 "The Importance of Being Forry" Mr. Monster's Movie Gold by Forrest Ackerman 81 "In the Beginning..." The Writer Apr 87 "An Interview With Myself" Writer's Digest Jan 79 "Introduction" The Arbor House Treasury of Horror and the Supernatural compiled by Bill Pronzini, Barry N. Malzberg, Martin H. Greenberg 81 "Introduction" The Blackboard Jungle by Evan Hunter 84 "Introduction" Frankenstein/Dracula/Dr. Jekyll and Mr. Hyde by Mary Shelley, Bram Stoker and Robert Louis Stevenson 78 "Introduction" (plus manuscript page) Lord John Signatures "Introduction" Tales by Moonlight by Jessica Salmonson 83 "Introduction" When Michael Calls by John Farris 81 "Introduction for "'The Shapes of Midnight'" The Shapes of Midnight by Joseph Payne Brennan 80 "Introduction to the Marvel Edition of Frankenstein" Frankenstein or the Modern Prometheus by Mary Wollstonecraft Shelley "The Irish King" New York Daily News Mar 16, 84 "The King Speaks" Twilight Zone Oct 85 "King Testifies" Fantasy Review May 85 "King Vs. Chalker, One Last Round" Fantasy Review May 86 "King's Garbage Truck" The Maine Campus Apr 16, 70 "King's Garbage Truck" Maine Fall 89 "Kitschin' a la King" Entertainment Weekly May 12, 95 "A Letter From Stephen King" Fantasy Review Jan 84 "Let's Scare Dick and Jane" The Washington Post Bookworld May 11, 86 "Lists That Matter" Castle Rock Feb 86 "Lists That Matter - Number 7" Castle Rock Aug 85 "Lists That Matter - Number 8" Castle Rock Sep 85 "Lists That Matter - No. 14" Castle Rock Oct 85 "A Look at the Red Sox on the Edge of '87" Bangor Daily News Mar 28-29, 87 "The Ludlum Attraction" The Washington Post Bookworld Mar 7, 82 "Mentors" Rolling Stone Apr 15, 82 "My Say" Publishers Weekly Dec 20, 85 "My Ten Favorite Fantasy-Horror Novels/My Ten Favorite Fantasy-Horror Short Stories or Novellas" How to Write Tales of Horror, Fantasy, & Science Fiction 87 "Nightmares in the Sky" 88 "1984, a Bad Year If You Fear Friday the 13th" The New York Times Apr 12, 84 "Not Guilty" The New York Times Book Review Oct 24, 76 "Notes on Horror" Quest Jun 81 "A Novelist's Perspective on Bangor" Black Magic and Music by Stephen King and Brad Terry Mar 27, 83 "Now You Take 'Bambi' or 'Snow White' - That's Scary" TV Guide Jun 13, 81 "On Becoming a Brand Name" Fear Itself: The Horror Fiction of Stephen King ed. by Tim Underwood & Chuck Miller 82 "On the Far Side" The Far Side Gallery 2 by Gary Larson 86 "On The Shining and Other Perpetrations" Whispers #17/18 Aug 82 "Peter Straub: An Informal Appreciation" World Fantasy Convention '82 Program Book "A Pilgrim's Progress" American Bookseller Jan 80 "The Politics of Limited Editions Part I" Castle Rock Jun 85 "A Possible Fairy Tale" The Paper May 8, 70 "A Postscript to Overdrive" Castle Rock Feb 87 "A Profile of Robert Bloch" World Fantasy Convention Program Book 83 "Red Sox Fan Crows About Team, But May Have to Eat Chicken" Bangor Daily News May 17-18, 86 "Regis Reprimandum" Fantasy Review Dec 85 "Rockin' with the Remainders" Playboy Sep 94 "Ross Thomas Stirs the Pot" The Washington Post Bookworld Oct 16, 83 "A Satiric Punch" Time Oct 11, 93 "Say 'No' to the Enforcers" Castle Rock Aug 86 "Silence of the Lambs" Washington Post Bookworld Nov 17, 91 "SK Clarifies Gardner Reference" Castle Rock May/Jun 88 "SK Criticized for Reference to Blacks" Castle Rock Mar 88 "Solving the Mystery of Bobby's Return to _Dallas_" TV Guide Aug 30, 86 "Someone Shouted J'accuse" The Summer Campus Jul 2, 70 "Son of Best Seller Stalks the Moors" The New York Times Book Review Jun 6, 93 "Special Make-Up Effects and the Writer" Bizarro by Tom Savini "Stephen King" The Arbor House Celebrity Book of Horror Stories 82 "Stephen King" Dreamworks Summer 81 "Stephen King" A Gift From Maine by Maine's Foremost Artists and Writers and James Plummer's Sixth Grade Class 83 "Stephen King" GQ Jul 84 "Stephen King Comments on It" Castle Rock Jul 86 "Stephen King's Guilty Pleasures" Film Comment May/Jun 81 "Stephen King's 10 Favorite Horror Books or Short Stories" The Book of Lists 3 "Theodore Sturgeon (1918-1985)" The Washington Post Bookworld May 26, 85 "Tough Talk and Tootsies, Just 25 Cents" USA Today May 23, 86 "The Triple Whammy" Castle Rock Nov 87 "Turning the Thumbscrews on the Reader" Book of the Month Club News Jun 87 "The Ultimate Catalogue" Castle Rock Jun 89 "Visit With an Endangered Species" Playboy Jan 82 "A Warning From...Stephen King" Disney's Adventures Oct 91 "What Stephen King Does For Love" Seventeen Apr 90 "What Went Down When Magyk Went Up" The New York Times Book Review Feb 9, 85 "What's Scaring Stephen King" Omni Feb 87 "Whining About the Movies in Bangor: Take That, 'Top Gun'" Bangor Daily News Apr 9, 87 "Why I Am For Gary Hart" The New Republic Jun 4, 84 "Why I Choose Batman" Batman #400 "Why I Wrote The Eyes of the Dragon" Castle Rock Feb 87 "Writing a First Novel Part IV" The Writer Jun 75 "You Gotta Put on the Gruesome Mask and Go Booga-Booga!" TV Guide Dec 5, 81 Puzzles "Horrors!" Games Oct 83
Last updated: Mar 13, 1996