List of box office top fifty horror films of the 1970s in the United States

1970

 * The Dunwich Horror
 * I Drink Your Blood

1971

 * The Corpse Grinders / The Embalmer [re-issue] / The Undertaker and his Pals [re-issue]
 * Blood Mania
 * Night of the Witches
 * Bigfoot
 * The Return of Count Yorga
 * The Blood on Satan's Claw / The Beast in the Cellar
 * The Incredible 2-Headed Transplant
 * The Night Visitor

1972

 * The Nightcomers
 * Dr Jekyll and Sister Hyde
 * Blood from the Mummy's Tomb
 * Black Belly of the Tarantula
 * Fright
 * The Dead Are Alive
 * Twins of Evil / Hands of the Ripper
 * Blacula
 * Son of Blob
 * The Virgin Witch

1973

 * The Legend of Hell House
 * The Hanging Woman
 * Baron Blood / The Thing with Two Heads
 * Terror in the Wax Museum

1974

 * Bat People
 * Sugar Hill
 * Slaughter Hotel
 * Dracula
 * The Mutations
 * Blood
 * The Touch of Satan

1975

 * The Giant Spider Invasion

1976

 * To the Devil a Daughter
 * God Told Me To

1977

 * Empire of the Ants
 * Tentacles
 * Catchy's Curse
 * The Pack
 * Shock Waves
 * Kingdom of the Spiders
 * The Crater Lake Monster

1978

 * I Spit on your Grave
 * The Toolbox Murders
 * The Bees

1979

 * Nosferatu the Vampyre
 * Screams of a Winter Night
 * Up from the Depths
 * Killer Fish

Trivia
I will update this later on today. Consider this a placeholder.
 * **Still not updated.