Based on the 2008 Census the population of Washington DC (the city not the surrounding area) is 591,833.
The Washington Metro Area has a population of 5,529,547. This is the 18th largest in all of the Americas (north and south). (see Wikipedia reference)
The Washington Primary Statistical Metropolitan Area consists of the following counties:
District of Columbia
Calvert County, MD
Charles County, MD
Frederick County, MD
Montgomery County, MD
Prince George's County, MD
Arlington County, VA
Clarke County, VA
Culpeper County, VA
Fairfax County, VA
Fauquier County, VA
King George County, VA
Loudoun County, VA
Prince William County, VA
Spotsylvania County, VA
Stafford County, VA
Warren County, VA
Alexandria city, VA
Fairfax city, VA
Falls Church city, VA
Fredericksburg city, VA
Manassas city, VA
Manassas Park city, VA
Berkeley County, WV
Jefferson County, WV
1,568,995,322,567,875,433,555
I think the population is about 6,000,000
Yes, Washington DC has a greater population than Ottawa. Washington DC has a population of around 700,000, while Ottawa has a population of around 1 million.
1,986,265,268 people
5.703948 × 106
According to the 2010 U. S. Census, Seattle's population rank is #1 in Washington and #23 in the U. S.
The population was about 596,000 based on the 2010 Census figure of 601,723.
According to the 2010 US Census, there were 601,723 residents of Washington, DC. However, there are a total of about 5,600,000 people in the Washington Metropolitan Area. An estimate in early 2012 was 617,996.
Houston.
The number of electors is based on the population. Washington, DC is relatively small.
The population of the United States in 1865 was 35.7 million people. The population of Washington DC in 1865 was approximately 109,199.
Washington DC was founded in 1790. At that time the closest population center was the city of Georgetown. DC was never a part of a larger city.