10.6 Million: …Baby One More Time
9.2 Million: Oops…I Did It Again
4.4 Million: Britney
3 Million: In the Zone
1.8 Million: Greatest Hits: My Prerogative
1.7 Million: Circus
1 Million: Blackout
803,000: Femme Fatale
276,000: Britney Jean
266,000: The Singles Collection
161,000: Playlist: The Very Best of Britney Spears
154,000: Glory
138,000: B in the Mix: The Remixes
55,000: The Essential Britney Spears
30,000: B in the Mix: The Remixes: Vol. 2

Spears has sold 33.6 million albums in the U.S. and ranks as the 18th-best selling album artist in the Nielsen SoundScan era (since 1991). Her songs have drawn 25 billion in cumulative radio airplay audience and 2.6 billion on-demand U.S. audio and video streams combined and she's sold 39.8 million singles (36.9 million via downloads).