These are the singles that reached number one on the Top 100 Singles chart in 1990 as published by Cash Box magazine.
Cashbox was a music industry trade magazine, originally published weekly from July 1942 to November 1996, and iconic brand. Ten years after its dissolution, it was revived as Cashbox Magazine, an online-only weekly chart that occasionally publishes special print issues.
 | Indicates best-performing single of 1990 |