A complete list of the Motown label's #1 hits on the Billboard Hot 100 (as well as their UK positions for fun):
MOTOWN
Billboard Hot 100
No. 1's
Plus position in UK singles chart
1961 - "Please Mr. Postman" The Marvelettes
1963 - "Fingertips--Pt. 2" Little Stevie Wonder
1964 - "My Guy" Mary Wells .. UK No.5
1964 - "Where Did Our Love Go" The Supremes .. UK No.3
1964 - "Baby Love" The Supremes .. UK No.1
1964 - "Come See About Me" The Supremes .. UK No.27
1965 - "My Girl" The Temptations .. No.43 (Reached No.2 when reissued in 1992)
1965 - "Stop! In the Name of Love" The Supremes .. UK No.7
1965 - "Back in My Arms Again" The Supremes .. UK No.40
1965 - "I Can't Help Myself (Sugar Pie, Honey Bunch)" Four Tops .. UK No.23
1965 - "I Hear a Symphony" The Supremes .. UK No.39
1966 - "You Can't Hurry Love" The Supremes .. UK No.3
1966 - "Reach Out I'll Be There" Four Tops .. UK No.1
1966 - "You Keep Me Hangin' On" The Supremes .. UK No.8
1967 - "Love Is Here and Now You're Gone" The Supremes .. UK No.17
1967 - "The Happening" The Supremes .. UK No.6
1968 - "Love Child" Diana Ross & the Supremes .. UK No.15
1968 - "I Heard It Through the Grapevine" Marvin Gaye .. UK No.1
1969 - "I Can't Get Next to You" The Temptations .. UK No.13
1969 - "Someday We'll Be Together" Diana Ross & the Supremes .. UK No.13
1970 - "I Want You Back" The Jackson 5 .. UK No.2
1970 - "ABC" The Jackson 5 .. UK No.8
1970 - "The Love You Save" The Jackson 5 .. UK No.7
1970 - "War" Edwin Starr .. UK No.3
1970 - "Ain't No Mountain High Enough" Diana Ross .. UK No.6
1970 - "I'll Be There" The Jackson 5 .. UK No.4
1970 - "The Tears of a Clown" Smokey Robinson & the Miracles .. UK No.1
1971 - "Just My Imagination (Running Away with Me)" The Temptations .. UK No.8
1972 - "Ben" Michael Jackson .. UK No.7
1972 - "Papa Was a Rollin' Stone" The Temptations .. UK No.14
1973 - "Superstition" Stevie Wonder .. UK No.11
1973 - "You Are the Sunshine of My Life" Stevie Wonder .. UK No.7
1973 - "Touch Me in the Morning" Diana Ross .. UK No.9
1973 - "Let's Get It On" Marvin Gaye .. UK No.31
1973 - "Keep on Truckin' (Part 1)" Eddie Kendricks .. UK No.18
1974 - "You Haven't Done Nothin'" Stevie Wonder .. UK No.30
1976 - "Theme from Mahogany (Do You Know Where You're Going To)" Diana Ross .. UK No.5
1976 - "Love Machine (Part 1)" The Miracles .. UK No.3
1976 - "Love Hangover" Diana Ross .. UK No.10
1977 - "I Wish" Stevie Wonder .. UK No.5
1977 - "Don't Leave Me This Way" Thelma Houston .. UK No.13
1977 - "Sir Duke" Stevie Wonder .. UK No.2
1977 - "Got to Give It Up (Pt. 1)" Marvin Gaye .. UK No.7
1978 - "Three Times a Lady" The Commodores .. UK No.1
1979 - "Still" The Commodores .. UK No.4
1980 - "Upside Down" Diana Ross .. UK No.2
1981 - "Endless Love" Diana Ross & Lionel Richie .. UK No.7
1982 - "Truly" Lionel Richie .. UK No.6
1983 - "All Night Long (All Night)" Lionel Richie .. UK No.2
1984 - "Hello" Lionel Richie .. UK No.1
1984 - "I Just Called to Say I Love You" Stevie Wonder .. UK No.1
1985 - "Part-Time Lover" Stevie Wonder .. UK No.3
1985 - "Say You, Say Me" Lionel Richie .. UK No.8
1991 - "End of the Road" Boyz II Men .. UK No.1
1994 - "I'll Make Love to You" Boyz II Men .. UK No.5
1994 - "On Bended Knee" Boyz II Men .. UK No.20
1997 - "4 Seasons of Loneliness" Boyz II Men .. UK No.10
http://www.funandmusic.biz/music-motown-no-1-hits.htm
About 57 songs, give or take. That should be enough for a rate, no? Should we add more hits that didn't hit #1?
Here's a list of all Motown songs that hit #1 on any chart:
http://top40-charts.com/news.php?nid=43528. It has ten discs of 10-18 songs each, but that may be too long for one rate.