# List of Billboard Adult Contemporary number ones of 2010

Adult Contemporary is a chart published by Billboard ranking the top-performing songs in the United States in the adult contemporary music (AC) market. In 2010, eight different songs topped the chart in 52 issues of the magazine, based on weekly airplay data from radio stations compiled by Nielsen Broadcast Data Systems.
On the first chart of the year, Taylor Swift was at number one with "You Belong with Me", the song's tenth consecutive week in the top spot. The song's unbroken run at the top ended at 13 weeks, although after two weeks out of the top spot it returned for one further week at number one in the issue of Billboard dated February 13. In the early portion of the year three songs had multiple spells at number one, including "Fallin' for You" by Colbie Caillat, which was twice replaced at number one only to rebound to the top of the chart. In the issue of Billboard dated April 3, country music group Lady Antebellum began a run of 13 consecutive weeks at number one with "Need You Now". The song was a chart-topper across multiple genres, and when it spent its tenth week at number one on the AC listing, it broke the record previously held by Rascal Flatts for the longest stay atop that chart by a country act. In topping the AC chart several months after it reached number one on the country listing, the song was seen as part of a trend of country songs quickly gaining success on country radio before going on to impact AC radio at a later date, thereby extending their lifespan across all of Billboard's charts.
The longest unbroken run at number one in 2010 was achieved by the band Train's song "Hey, Soul Sister", the group's first chart-topper since 2004, which spent 17 consecutive weeks in the top spot beginning in July. In total the song spent 19 weeks atop the chart in 2010, the most for a single song during the year. It would eventually spend a total of 22 weeks at number one, the second-highest figure at the time for the AC listing behind only Uncle Kracker's version of "Drift Away", which spent 28 weeks in the top spot in 2003 and 2004. Taylor Swift was the only act with more than one number one during the year, spending five weeks in the top spot with "You Belong with Me" and a single week with "Mine". The former song, which was released in different versions to country and pop/AC radio, has been seen by critics as a key stage in Swift's transition from a country singer to a pop artist. "Mine" was replaced at number one in the issue of Billboard dated December 18 by Mariah Carey's "Oh Santa!", which was the final AC number one of 2010. Carey's track had entered the chart the previous week, meaning that it made the fastest climb to number one since the AC chart began to be compiled using Nielsen data in 1993.

## Chart history

Key :
| † | Indicates best-performing AC song of 2010 |
| Issue date | Title | Artist(s) |
| January 2 | "You Belong with Me" | Taylor Swift |
| January 9 | "You Belong with Me" | Taylor Swift |
| January 16 | "You Belong with Me" | Taylor Swift |
| January 23 | "You Belong with Me" | Taylor Swift |
| January 30 | "Haven't Met You Yet" | Michael Bublé |
| February 6 | "Fallin' for You" | Colbie Caillat |
| February 13 | "You Belong with Me" | Taylor Swift |
| February 20 | "Fallin' for You" | Colbie Caillat |
| February 27 | "Fallin' for You" | Colbie Caillat |
| March 6 | "Fallin' for You" | Colbie Caillat |
| March 13 | "Haven't Met You Yet" | Michael Bublé |
| March 20 | "Haven't Met You Yet" | Michael Bublé |
| March 27 | "Fallin' for You" | Colbie Caillat |
| April 3 | "Need You Now" † | Lady Antebellum |
| April 10 | "Need You Now" † | Lady Antebellum |
| April 17 | "Need You Now" † | Lady Antebellum |
| April 24 | "Need You Now" † | Lady Antebellum |
| May 1 | "Need You Now" † | Lady Antebellum |
| May 8 | "Need You Now" † | Lady Antebellum |
| May 15 | "Need You Now" † | Lady Antebellum |
| May 22 | "Need You Now" † | Lady Antebellum |
| May 29 | "Need You Now" † | Lady Antebellum |
| June 5 | "Need You Now" † | Lady Antebellum |
| June 12 | "Need You Now" † | Lady Antebellum |
| June 19 | "Need You Now" † | Lady Antebellum |
| June 26 | "Need You Now" † | Lady Antebellum |
| July 3 | "Hey, Soul Sister" | Train |
| July 10 | "Need You Now" † | Lady Antebellum |
| July 17 | "Need You Now" † | Lady Antebellum |
| July 24 | "Hey, Soul Sister" | Train |
| July 31 | "Hey, Soul Sister" | Train |
| August 7 | "Hey, Soul Sister" | Train |
| August 14 | "Hey, Soul Sister" | Train |
| August 21 | "Hey, Soul Sister" | Train |
| August 28 | "Hey, Soul Sister" | Train |
| September 4 | "Hey, Soul Sister" | Train |
| September 11 | "Hey, Soul Sister" | Train |
| September 18 | "Hey, Soul Sister" | Train |
| September 25 | "Hey, Soul Sister" | Train |
| October 2 | "Hey, Soul Sister" | Train |
| October 9 | "Hey, Soul Sister" | Train |
| October 16 | "Hey, Soul Sister" | Train |
| October 23 | "Hey, Soul Sister" | Train |
| October 30 | "Hey, Soul Sister" | Train |
| November 6 | "Hey, Soul Sister" | Train |
| November 13 | "Hey, Soul Sister" | Train |
| November 20 | "Breakeven" | The Script |
| November 27 | "Hey, Soul Sister" | Train |
| December 4 | "Breakeven" | The Script |
| December 11 | "Mine" | Taylor Swift |
| December 18 | "Oh Santa!" | Mariah Carey |
| December 25 | "Oh Santa!" | Mariah Carey |