Baltimore County's population has been increasing since the 2000 census, illustrating a trend that most U.S. cities are experiencing: the continuing urban exodus to the suburbs.
The U.S. Census Bureau's Population Division estimated a drop of about 7,800 in city residents for the 12 months from July 2002 through June 2003.
The 2004 report, Annual Estimate of the Population for Counties of Maryland, shows the population of Baltimore County as 780,821.
That's 1,305 people per square mile, said the Census Bureau.
The third-most populous county - Montgomery is first, and Prince George's is second - Baltimore County has seen its population steadily grow.
In July 2003, the county was estimated to have 777,184 inhabitants, compared with 769,832 in July 2002; 762,728 in July 2001; 755,917 in July 2000; and 754,292 in the April 2000 census.
In 2002, the census estimated that Baltimore City's population declined by nearly 16,000 people - from 651,154 to 635,210 - for the 15 months from the census in April 2000 through June 2001.
Seven months later, the census revised its estimates, after reviewing housing and other data from the city, saying the city's population had declined by about 6,000 people.
A year ago, the Census Bureau estimated that the city population had declined by just under 9,000 people from July 2001 to June 2002.