These are the Top 100 singles of 1974 from Cash Box magazine. A whopping 48 singles reached No. 1 in 1974.
Issue date Song Artist January 5 "Leave Me Alone (Ruby Red Dress)" Helen Reddy January 12 "Time in a Bottle" Jim Croce January 19 "The Joker" Steve Miller Band January 26 "Show and Tell" Al Wilson February 2 "You're Sixteen" Ringo Starr February 9 "The Way We Were" Barbra Streisand February 16 "The Americans" Byron MacGregor February 23 "Love's Theme" Love Unlimited Orchestra March 2 "Seasons in the Sun" Terry Jacks March 9 March 16 "Boogie Down" Eddie Kendricks March 23 "Rock On" David Essex March 30 "Sunshine on My Shoulders" John Denver April 6 "Hooked on a Feeling" Blue Swede April 13 "Bennie and the Jets" Elton John April 20 "TSOP (The Sound of Philadelphia)" MFSB featuring The Three Degrees April 27 May 4 "The Loco-Motion" Grand Funk May 11 "The Show Must Go On" Three Dog Night May 18 "Dancing Machine" The Jackson 5 May 25 "The Streak" Ray Stevens June 1 "The Entertainer" Marvin Hamlisch June 8 "Band on the Run" Paul McCartney and Wings June 15 June 22 "You Make Me Feel Brand New" The Stylistics June 29 "Sundown" Gordon Lightfoot July 6 "Billy Don't Be a Hero" Bo Donaldson and the Heywoods July 13 "Rock the Boat" The Hues Corporation July 20 "Rock Your Baby" George McCrae July 27 "Annie's Song" John Denver August 3 "Don't Let the Sun Go Down on Me" Elton John August 10 "The Night Chicago Died" Paper Lace August 17 "Feel Like Makin' Love" Roberta Flack August 24 "(You're) Having My Baby" Paul Anka and Odia Coates August 31 "Tell Me Something Good" Rufus September 7 "I Shot the Sheriff" Eric Clapton September 14 "Can't Get Enough of Your Love, Babe" Barry White September 21 "I Honestly Love You" Olivia Newton-John September 28 "Rock Me Gently" Andy Kim October 5 "Then Came You" Dionne Warwick and Spinners October 12 "Nothing from Nothing" Billy Preston October 19 "I Honestly Love You" Olivia Newton-John October 26 "Can't Get Enough" Bad Company November 2 "You Haven't Done Nothin'" Stevie Wonder November 9 "Jazzman" Carole King November 16 "Whatever Gets You thru the Night" John Lennon November 23 "You Ain't Seen Nothing Yet" Bachman-Turner Overdrive November 30 "I Can Help" Billy Swan December 7 "When Will I See You Again" The Three Degrees December 14 "Kung Fu Fighting" Carl Douglas December 21 "Angie Baby" Helen Reddy December 28 "Cat's in the Cradle" Harry Chapin
References http://www.cashboxmagazine.com/archives/70s_files/1974.html
See also 1974 in music Hot 100 number-one hits of 1974 (USA) by Billboard magazine RPM number-one hits of 1974 for the #1 hits in Canada