The US Census’ newest county-level population estimates show that between 2012 and 2013, the District of Columbia added more residents than any other metro area county.

Loudoun County grew slightly faster by percentage. But even according to that measure, DC is second.

County 2012

population

2013

population

Raw

growth

Percent

growth

District of Columbia 633,427 646,449 13,022 2.1
Loudoun (VA) 337,248 349,679 12,431 3.7
Fairfax (VA) 1,118,683 1,130,924 12,241 1.1
Montgomery (MD) 1,004,476 1,016,677 12,201 1.2
Prince George’s (MD) 881,419 890,081 8,662 1.0
Prince William (VA) 430,100 438,580 8,480 2.0
Anne Arundel (MD) 550,175 555,743 5,568 1.0
Baltimore County (MD) 817,682 823,015 5,333 0.7
Howard (MD) 299,356 304,580 5,224 1.7
Arlington (VA) 221,275 224,906 3,631 1.6
Stafford (VA) 134,251 136,788 2,537 1.9
Charles (MD) 150,710 152,864 2,154 1.4
Alexandria (VA) 146,839 148,892 2,053 1.4
Frederick (MD) 239,520 241,409 1,889 0.8
Spotsylvania (VA) 125,772 127,348 1,576 1.3
Fauquier (VA) 66,526 67,207 681 1.0
Baltimore City (MD) 622,417 622,104 -313 -0.1

Cross-posted at BeyondDC.

Dan Malouff is a transportation planner for Arlington and professor of geography at George Washington University, but blogs to express personal views. He has a degree in urban planning from the University of Colorado and lives in northeast DC. He runs BeyondDC and contributes to the Washington Post .