Not even three years ago, it seemed like there was still a long way to go before D.C. had more people than Baltimore. At the time of the 2010 census, Baltimore had nearly 20,000 more residents than Washington: 620,961 to 601,723. But Washington's growth has been booming for more than a decade, while Baltimore's population is stagnant.
The District gained more than 13,000 residents between July 2011 and July 2012. The U.S. Census Bureau on Thursday put D.C.'s population on July 1, 2012 at 632,323 -- up from 619,020 a year earlier. In contrast, on July 1, 2011 Baltimore's population was estimated by the Census Bureau to be 619,493, down from 620,560 a year earlier.