# List of number-one digital songs of 2009 (U.S.)

The highest-selling digital singles in the United States are ranked in the Hot Digital Songs chart, published by Billboard magazine. The data are compiled by Nielsen SoundScan based on each single's weekly digital sales, which combines sales of different versions of a single for a summarized figure.

## Chart history

Key :
| † | Indicates best-charting digital song of 2009 |
| Issue date | Song | Artist(s) | Weekly sales |
| January 3 | "Single Ladies (Put a Ring on It)" | Beyoncé | 149,000 |
| January 10 | "Just Dance" | Lady Gaga featuring Colby O'Donis | 419,000 |
| January 17 | "Just Dance" | Lady Gaga featuring Colby O'Donis | 279,000 |
| January 24 | "Just Dance" | Lady Gaga featuring Colby O'Donis | 213,000 |
| January 31 | "Just Dance" | Lady Gaga featuring Colby O'Donis | 192,000 |
| February 7 | "My Life Would Suck Without You" | Kelly Clarkson | 280,000 |
| February 14 | "My Life Would Suck Without You" | Kelly Clarkson | 216,000 |
| February 21 | "Crack a Bottle" | Eminem, Dr. Dre and 50 Cent | 418,000 |
| February 28 | "Right Round" | Flo Rida | 636,000 |
| March 7 | "Right Round" | Flo Rida | 460,000 |
| March 14 | "Right Round" | Flo Rida | 334,000 |
| March 21 | "Right Round" | Flo Rida | 319,000 |
| March 28 | "Right Round" | Flo Rida | 278,000 |
| April 4 | "Right Round" | Flo Rida | 224,000 |
| April 11 | "Poker Face" | Lady Gaga | 206,000 |
| April 18 | "Boom Boom Pow" † | The Black Eyed Peas | 465,000 |
| April 25 | "Boom Boom Pow" † | The Black Eyed Peas | 335,000 |
| May 2 | "Boom Boom Pow" † | The Black Eyed Peas | 259,000 |
| May 9 | "Boom Boom Pow" † | The Black Eyed Peas | 226,000 |
| May 16 | "Boom Boom Pow" † | The Black Eyed Peas | 212,000 |
| May 23 | "Boom Boom Pow" † | The Black Eyed Peas | 215,000 |
| May 30 | "Boom Boom Pow" † | The Black Eyed Peas | 204,000 |
| June 6 | "Boom Boom Pow" † | The Black Eyed Peas | 240,000 |
| June 13 | "Boom Boom Pow" † | The Black Eyed Peas | 220,000 |
| June 20 | "Boom Boom Pow" † | The Black Eyed Peas | 205,000 |
| June 27 | "I Gotta Feeling" | The Black Eyed Peas | 249,000 |
| July 4 | "I Gotta Feeling" | The Black Eyed Peas | 232,000 |
| July 11 | "I Gotta Feeling" | The Black Eyed Peas | 203,000 |
| July 18 | "I Gotta Feeling" | The Black Eyed Peas | 215,000 |
| July 25 | "I Gotta Feeling" | The Black Eyed Peas | 205,000 |
| August 1 | "I Gotta Feeling" | The Black Eyed Peas | 219,000 |
| August 8 | "I Gotta Feeling" | The Black Eyed Peas | 223,000 |
| August 15 | "I Gotta Feeling" | The Black Eyed Peas | 215,000 |
| August 22 | "I Gotta Feeling" | The Black Eyed Peas | 197,000 |
| August 29 | "Party in the U.S.A." | Miley Cyrus | 226,000 |
| September 5 | "Party in the U.S.A." | Miley Cyrus | 211,000 |
| September 12 | "Party in the U.S.A." | Miley Cyrus | 190,000 |
| September 19 | "Party in the U.S.A." | Miley Cyrus | 179,000 |
| September 26 | "I Gotta Feeling" | The Black Eyed Peas | 179,000 |
| October 3 | "Empire State of Mind" | Jay-Z and Alicia Keys | 205,000 |
| October 10 | "Party in the U.S.A." | Miley Cyrus | 182,000 |
| October 17 | "Party in the U.S.A." | Miley Cyrus | 177,000 |
| October 24 | "3" | Britney Spears | 255,000 |
| October 31 | "3" | Britney Spears | 171,000 |
| November 7 | "Fireflies" | Owl City | 196,000 |
| November 14 | "Fireflies" | Owl City | 173,000 |
| November 21 | "Fireflies" | Owl City | 194,000 |
| November 28 | "Fireflies" | Owl City | 181,000 |
| December 5 | "Bad Romance" | Lady Gaga | 209,000 |
| December 12 | "Bad Romance" | Lady Gaga | 218,000 |
| December 19 | "Bad Romance" | Lady Gaga | 189,000 |
| December 26 | "Bad Romance" | Lady Gaga | 183,000 |