This article documents the history of African-Americans or Black Philadelphians in Philadelphia. Recent 2010 estimates by the U.S. Census Bureau put the total number of people living in Philadelphia who identify as Black or African-American at 644,287, or 42.2% of the city's total population. People of African descent are currently the largest ethnic group in Philadelphia. Originally arriving in the 17th century as enslaved Africans, the population of African Americans in Philadelphia grew in the 18th and 19th centuries to include numerous free black residents who were active in the abolitionist movement and as conductors in the Underground Railroad. In the 20th and 21st centuries, Black Philadelphians actively campaigned against discrimination and continued to contribute to Philadelphia's