List of Billboard Mainstream Top 40 number-one songs of 2009

This is a list of songs which reached number one on the Billboard Mainstream Top 40 (or Pop Songs) chart in 2009.

Chart history
Issue date Song Artist(s) Ref.
January 3"Womanizer"Britney Spears[1]
January 10"Live Your Life"T.I. featuring Rihanna[2]
January 17"Womanizer"Britney Spears[3]
January 24"Just Dance"Lady Gaga featuring Colby O'Donis[4]
January 31[5]
February 7"Single Ladies (Put a Ring on It)"Beyoncé[6]
February 14[7]
February 21[8]
February 28"Love Story"Taylor Swift[9]
March 7"Circus"Britney Spears[10]
March 14"Gives You Hell"The All-American Rejects[11]
March 21[12]
March 28[13]
April 4[14]
April 11"Right Round"Flo Rida featuring Ke$ha[15]
April 18[16]
April 25"Poker Face"Lady Gaga[17]
May 2[18]
May 9[19]
May 16[20]
May 23[21]
May 30"Boom Boom Pow"The Black Eyed Peas[22]
June 6[23]
June 13[24]
June 20[25]
June 27[26]
July 4[27]
July 11[28]
July 18"Don't Trust Me"3OH!3[29]
July 25"LoveGame"Lady Gaga[30]
August 1[31]
August 8"Waking Up in Vegas"Katy Perry[32]
August 15[33]
August 22"I Gotta Feeling"The Black Eyed Peas[34]
August 29[35]
September 5[36]
September 12[37]
September 19[38]
September 26[39]
October 3[40]
October 10"Use Somebody"Kings of Leon[41]
October 17"Down"Jay Sean featuring Lil Wayne[42]
October 24[43]
October 31[44]
November 7"Party in the U.S.A."Miley Cyrus[45]
November 14"Paparazzi"Lady Gaga[46]
November 21[47]
November 28"Whatcha Say"Jason Derülo[48]
December 5[49]
December 12[50]
December 19[51]
December 26"Replay"Iyaz[52]

See also

References
  1. "Billboard Pop Songs: Week Ending January 3, 2009". Billboard. Nielsen Business Media, Inc. 2009-01-03. Retrieved 2012-04-22.
  2. "Billboard Pop Songs: Week Ending January 10, 2009". Billboard. Nielsen Business Media, Inc. 2009-01-10. Retrieved 2012-04-22.
  3. "Billboard Pop Songs: Week Ending January 17, 2009". Billboard. Nielsen Business Media, Inc. 2009-01-17. Retrieved 2012-04-22.
  4. "Billboard Pop Songs: Week Ending January 24, 2009". Billboard. Nielsen Business Media, Inc. 2009-01-24. Retrieved 2012-04-22.
  5. "Billboard Pop Songs: Week Ending January 31, 2009". Billboard. Nielsen Business Media, Inc. 2009-01-31. Retrieved 2012-04-22.
  6. "Billboard Pop Songs: Week Ending February 7, 2009". Billboard. Nielsen Business Media, Inc. 2009-02-07. Retrieved 2012-04-22.
  7. "Billboard Pop Songs: Week Ending February 14, 2009". Billboard. Nielsen Business Media, Inc. 2009-02-14. Retrieved 2012-04-22.
  8. "Billboard Pop Songs: Week Ending February 21, 2009". Billboard. Nielsen Business Media, Inc. 2009-02-21. Retrieved 2012-04-22.
  9. "Billboard Pop Songs: Week Ending February 28, 2009". Billboard. Nielsen Business Media, Inc. 2009-02-28. Retrieved 2012-04-22.
  10. "Billboard Pop Songs: Week Ending March 7, 2009". Billboard. Nielsen Business Media, Inc. 2009-03-07. Retrieved 2012-04-22.
  11. "Billboard Pop Songs: Week Ending March 14, 2009". Billboard. Nielsen Business Media, Inc. 2009-03-14. Retrieved 2012-04-22.
  12. "Billboard Pop Songs: Week Ending March 21, 2009". Billboard. Nielsen Business Media, Inc. 2009-03-21. Retrieved 2012-04-22.
  13. "Billboard Pop Songs: Week Ending March 28, 2009". Billboard. Nielsen Business Media, Inc. 2009-03-28. Retrieved 2012-04-22.
  14. "Billboard Pop Songs: Week Ending April 4, 2009". Billboard. Nielsen Business Media, Inc. 2009-04-04. Retrieved 2012-04-22.
  15. "Billboard Pop Songs: Week Ending April 11, 2009". Billboard. Nielsen Business Media, Inc. 2009-04-11. Retrieved 2012-04-22.
  16. "Billboard Pop Songs: Week Ending April 18, 2009". Billboard. Nielsen Business Media, Inc. 2009-04-18. Retrieved 2012-04-22.
  17. "Billboard Pop Songs: Week Ending April 25, 2009". Billboard. Nielsen Business Media, Inc. 2009-04-25. Retrieved 2012-04-22.
  18. "Billboard Pop Songs: Week Ending May 2, 2009". Billboard. Nielsen Business Media, Inc. 2009-05-02. Retrieved 2012-04-22.
  19. "Billboard Pop Songs: Week Ending May 9, 2009". Billboard. Nielsen Business Media, Inc. 2009-05-09. Retrieved 2012-04-22.
  20. "Billboard Pop Songs: Week Ending May 16, 2009". Billboard. Nielsen Business Media, Inc. 2009-05-16. Retrieved 2012-04-22.
  21. "Billboard Pop Songs: Week Ending May 23, 2009". Billboard. Nielsen Business Media, Inc. 2009-05-23. Retrieved 2012-04-22.
  22. "Billboard Pop Songs: Week Ending May 30, 2009". Billboard. Nielsen Business Media, Inc. 2009-05-30. Retrieved 2012-04-22.
  23. "Billboard Pop Songs: Week Ending June 6, 2009". Billboard. Nielsen Business Media, Inc. 2009-06-06. Retrieved 2012-04-22.
  24. "Billboard Pop Songs: Week Ending June 13, 2009". Billboard. Nielsen Business Media, Inc. 2009-06-13. Retrieved 2012-04-22.
  25. "Billboard Pop Songs: Week Ending June 20, 2009". Billboard. Nielsen Business Media, Inc. 2009-06-20. Retrieved 2012-04-22.
  26. "Billboard Pop Songs: Week Ending June 27, 2009". Billboard. Nielsen Business Media, Inc. 2009-06-27. Retrieved 2012-04-22.
  27. "Billboard Pop Songs: Week Ending July 4, 2009". Billboard. Nielsen Business Media, Inc. 2009-07-04. Retrieved 2012-04-22.
  28. "Billboard Pop Songs: Week Ending July 11, 2009". Billboard. Nielsen Business Media, Inc. 2009-07-11. Retrieved 2012-04-22.
  29. "Billboard Pop Songs: Week Ending July 18, 2009". Billboard. Nielsen Business Media, Inc. 2009-07-18. Retrieved 2012-04-22.
  30. "Billboard Pop Songs: Week Ending July 25, 2009". Billboard. Nielsen Business Media, Inc. 2009-07-25. Retrieved 2012-04-22.
  31. "Billboard Pop Songs: Week Ending August 1, 2009". Billboard. Nielsen Business Media, Inc. 2009-08-01. Retrieved 2012-04-22.
  32. "Billboard Pop Songs: Week Ending August 8, 2009". Billboard. Nielsen Business Media, Inc. 2009-08-08. Retrieved 2012-04-22.
  33. "Billboard Pop Songs: Week Ending August 15, 2009". Billboard. Nielsen Business Media, Inc. 2009-08-15. Retrieved 2012-04-22.
  34. "Billboard Pop Songs: Week Ending August 22, 2009". Billboard. Nielsen Business Media, Inc. 2009-08-22. Retrieved 2012-04-22.
  35. "Billboard Pop Songs: Week Ending August 29, 2009". Billboard. Nielsen Business Media, Inc. 2009-08-29. Retrieved 2012-04-22.
  36. "Billboard Pop Songs: Week Ending September 5, 2009". Billboard. Nielsen Business Media, Inc. 2009-09-05. Retrieved 2012-04-22.
  37. "Billboard Pop Songs: Week Ending September 12, 2009". Billboard. Nielsen Business Media, Inc. 2009-09-12. Retrieved 2012-04-22.
  38. "Billboard Pop Songs: Week Ending September 19, 2009". Billboard. Nielsen Business Media, Inc. 2009-09-19. Retrieved 2012-04-22.
  39. "Billboard Pop Songs: Week Ending September 26, 2009". Billboard. Nielsen Business Media, Inc. 2009-09-26. Retrieved 2012-04-22.
  40. "Billboard Pop Songs: Week Ending October 3, 2009". Billboard. Nielsen Business Media, Inc. 2009-10-03. Retrieved 2012-04-22.
  41. "Billboard Pop Songs: Week Ending October 10, 2009". Billboard. Nielsen Business Media, Inc. 2009-10-10. Retrieved 2012-04-22.
  42. "Billboard Pop Songs: Week Ending October 17, 2009". Billboard. Nielsen Business Media, Inc. 2009-10-17. Retrieved 2012-04-22.
  43. "Billboard Pop Songs: Week Ending October 24, 2009". Billboard. Nielsen Business Media, Inc. 2009-10-24. Retrieved 2012-04-22.
  44. "Billboard Pop Songs: Week Ending October 31, 2009". Billboard. Nielsen Business Media, Inc. 2009-10-31. Retrieved 2012-04-22.
  45. "Billboard Pop Songs: Week Ending November 7, 2009". Billboard. Nielsen Business Media, Inc. 2009-11-07. Retrieved 2012-04-22.
  46. "Billboard Pop Songs: Week Ending November 14, 2009". Billboard. Nielsen Business Media, Inc. 2009-11-14. Retrieved 2012-04-22.
  47. "Billboard Pop Songs: Week Ending November 21, 2009". Billboard. Nielsen Business Media, Inc. 2009-11-21. Retrieved 2012-04-22.
  48. "Billboard Pop Songs: Week Ending November 28, 2009". Billboard. Nielsen Business Media, Inc. 2009-11-28. Retrieved 2012-04-22.
  49. "Billboard Pop Songs: Week Ending December 5, 2009". Billboard. Nielsen Business Media, Inc. 2009-12-05. Retrieved 2012-04-22.
  50. "Billboard Pop Songs: Week Ending December 12, 2009". Billboard. Nielsen Business Media, Inc. 2009-12-12. Retrieved 2012-04-22.
  51. "Billboard Pop Songs: Week Ending December 19, 2009". Billboard. Nielsen Business Media, Inc. 2009-12-19. Retrieved 2012-04-22.
  52. "Billboard Pop Songs: Week Ending December 26, 2009". Billboard. Nielsen Business Media, Inc. 2009-12-26. Retrieved 2012-04-22.
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