Metro Atlanta has indeed cracked 6 million, using 2011 Census estimates:
Atlanta-Athens-Clarke County-Sandy Springs, GA CSA
Athens-Clarke County, GA MSA
Clarke 117,344
Madison 27,921
Oconee 33,366
Oglethorpe 14,686
Total: 193,317
Atlanta-Sandy Springs-Roswell, GA MSA
Barrow 69,912
Bartow 100,421
Butts 23,504
Carroll 111,159
Cherokee 218,286
Clayton 261,532
Cobb 697,553
Coweta 129,629
Dawson 22,459
DeKalb 699,893
Douglas 133,355
Fayette 107,784
Forsyth 181,840
Fulton 949,599
Gwinnett 824,941
Haralson 28,638
Heard 11,744
Henry 207,360
Jasper 13,885
Lamar 18,194
Meriwether 21,617
Morgan 17,961
Newton 100,814
Paulding 143,542
Pickens 29,415
Pike 17,751
Rockdale 85,765
Spalding 64,033
Walton 84,580
Total: 5,377,166
Calhoun, GA µSA
Gordon 55,621
Cedartown, GA µSA
Polk 41,211
Gainesville, GA MSA
Hall 183,052
Jefferson, GA µSA
Jackson 61,257
LaGrange, GA µSA
Troup 67,764
Thomaston, GA µSA
Upson 26,977
Total: 6,006,365
Atlanta MSA lost Putnam County but added Morgan County.
Valley, AL µSA was taken away.
Athens-Clarke County MSA, Jefferson µSA, and Calhoun µSA were added.
Fulton and Gwinnett Counties have received the bulk of the area's growth since 2010.