Billboard Hot 100 - 2009
January 3
January 10
"Single Ladies (Put A Ring On It)" by Beyonce
"Single Ladies (Put A Ring On It)" was The Hot 100's #1 song on January 3 and January 10.
January 17
January 24
January 31
"Just Dance" by Lady Gaga Featuring Colby O'Donis
"Just Dance" was The Hot 100's #1 song on January 17, January 24, and January 31.
February 7
February 14
"My Life Would Suck Without You" by Kelly Clarkson
"My Life Would Suck Without You" was The Hot 100's #1 song on February 7 and February 14.
February 21
"Crack A Bottle" by Eminem, Dr. Dre & 50 Cent
"Crack A Bottle" was The Hot 100's #1 song on February 21.
February 28
March 7
March 14
March 21
March 28
April 4
"Right Round" by Flo Rida
"Right Round" was The Hot 100's #1 song on February 28, March 7, March 14, March 21, March 28, and April 4.
April 11
"Poker Face" by Lady Gaga
"Poker Face" was The Hot 100's #1 song on April 11.
April 18
April 25
May 2
May 9
May 16
May 23
May 30
June 6
June 13
June 20
June 27
July 4
"Boom Boom Pow" by The Black Eyed Peas
"Boom Boom Pow" was The Hot 100's #1 song on April 18, April 25, May 2, May 9, May 16, May 23, May 30, June 6, June 13, June 20, June 27, and July 4.
July 11
July 18
July 25
August 1
August 8
August 15
August 22
August 29
September 5
September 12
September 19
September 26
October 3
October 10
"I Gotta Feeling" by The Black Eyed Peas
"I Gotta Feeling" was The Hot 100's #1 song on July 11, July 18, July 25, August 1, August 8, August 15, August 22, August 29, September 5, September 12, September 19, September 26, October 3, and October 10.
October 17
"Down" by Jay Sean Featuring Lil Wayne
"Down" was The Hot 100's #1 song on October 17.
October 31
"Down" by Jay Sean Featuring Lil Wayne
"Down" was The Hot 100's #1 song on October 31.
November 7
"Fireflies" by Owl City
"Fireflies" was The Hot 100's #1 song on November 7.
November 14
"Whatcha Say" by Jason Derulo
"Whatcha Say" was The Hot 100's #1 song on November 14.
November 21
"Fireflies" by Owl City
"Fireflies" was The Hot 100's #1 song on November 21.
November 28
December 5
December 12
December 19
December 26