"Where Did our Love Go" in the second half of '64, then "Baby Love" in late 64/early 65, "Come See about Me","Stop in the Name of Love" and "Back in my Arms Again" all also in 1965.
"Where Did Our Love Go" was recorded rather reluctantly by the Supremes, as they didn't think it would be a big hit.
Interestingly (for some people), although those were the first five #1's in the States for the Supremes, in Australia "Where Did Our Love Go" only made it to #19, "Baby Love" to #38, and the other three didn't chart in the Top 40. They never had a #1 in Australia (although "The Happening" made it to #2, and Diana Ross did it thrice in the '80's as a soloist.