List of number one hits in the Mainstream Top 40 (2009)
This list contains all of the number one hits on the mainstream Top 40 charts in 2009. They were published by the US magazine Billboard . There were 20 top runners this year.
| Singles | |
|---|---|
|
|
This list contains all of the number one hits on the mainstream Top 40 charts in 2009. They were published by the US magazine Billboard . There were 20 top runners this year.
| Singles | |
|---|---|
|
|