Here are the numbers for each county in the MSA. Remember, these numbers will likely be revised (upwards) as they tend to be every year.
Bucks County
2010 Census: 625,249
2014 preliminary: 626,685
2014 revised: 626,608
2015 preliminary: 627,367
Burlington County (NJ)
2010 Census: 448,734
2014 preliminary: 449,722
2014 revised: 450,677
2015 preliminary: 450,226
Camden County (NJ)
2010 Census: 513,657
2014 preliminary: 511,038
2014 revised: 510,967
2015 preliminary: 510,923
Cecil County (MD)
2010 Census: 101,108
2014 preliminary: 102,383
2014 revised: 102,135
2015 preliminary: 102,382
Chester County
2010 Census: 498,886
2014 preliminary: 512,784
2014 revised: 513,291
2015 preliminary: 515,939
Delaware County
2010 Census: 558,979
2014 preliminary: 562,960
2014 revised: 562,957
2015 preliminary: 563,894
Gloucester County (NJ)
2010 Census: 288,288
2014 preliminary: 290,951
2014 revised: 290,898
2015 preliminary: 291,479
Montgomery County
2010 Census: 799,874
2014 preliminary: 816,857
2014 revised: 816,608
2015 preliminary: 819,264
New Castle County (DE)
2010 Census: 538,479
2014 preliminary: 552,778
2014 revised: 553,347
2015 preliminary: 556,779
Philadelphia County
2010 Census: 1,526,006
2014 preliminary: 1,560,297
2014 revised: 1,561,562
2015 preliminary: 1,567,442
Salem County (NJ)
2010 Census: 66,083
2014 preliminary: 64,715
2014 revised: 64,670
2015 preliminary: 64,180
Philadelphia MSA
2010 Census: 5,965,343
2014 preliminary: 6,051,170
2014 revised: 6,053,720
2015 preliminary: 6,069,875