This is a list of songs which reached number one on the Billboard Mainstream Top 40 (or Pop Songs) chart in 2009.
During 2009, a total of 20 singles hit number-one on the charts.
Chart history Issue date Song Artist(s) Ref. January 3 "Womanizer" Britney Spears January 10 "Live Your Life" T.I. featuring Rihanna January 17 "Womanizer" Britney Spears January 24 "Just Dance" Lady Gaga featuring Colby O'Donis January 31 February 7 "Single Ladies (Put a Ring on It)" Beyoncé February 14 February 21 February 28 "Love Story" Taylor Swift March 7 "Circus" Britney Spears March 14 "Gives You Hell" The All-American Rejects March 21 March 28 April 4 April 11 "Right Round" Flo Rida featuring Ke$ha April 18 April 25 "Poker Face" Lady Gaga May 2 May 9 May 16 May 23 May 30 "Boom Boom Pow" The Black Eyed Peas June 6 June 13 June 20 June 27 July 4 July 11 July 18 "Don't Trust Me" 3OH!3 July 25 "LoveGame" Lady Gaga August 1 August 8 "Waking Up in Vegas" Katy Perry August 15 August 22 "I Gotta Feeling" The Black Eyed Peas August 29 September 5 September 12 September 19 September 26 October 3 October 10 "Use Somebody" Kings of Leon October 17 "Down" Jay Sean featuring Lil Wayne October 24 October 31 November 7 "Party in the U.S.A." Miley Cyrus November 14 "Paparazzi" Lady Gaga November 21 November 28 "Whatcha Say" Jason Derülo December 5 December 12 December 19 December 26 "Replay" Iyaz
See also 2009 in music
References
External links Current Billboard Pop Songs chart