<P> During the last decade, Philadelphia experienced a large shift in its age profile . In 2000, the city's population pyramid had a largely stationary shape . In 2013, the city took on an expansive pyramid shape, with an increase in the three millennial age groups, 20 to 24, 25 to 29, and 30 to 34 . The city's 25 - to 29 - year - old age group was the city's largest age cohort . According to the 2010 Census, 343,837 (22.5%) were under the age of 18; 203,697 (13.3%) from 18 to 24; 434,385 (28.5%) from 25 to 44; 358,778 (23.5%) from 45 to 64; and 185,309 (12.1%) who were 65 years of age or older . The median age was 33.5 years . For every 100 females there were 89.4 males . For every 100 females age 18 and over, there were 85.7 males . The city had 22,018 births in 2013, down from a peak 23,689 births in 2008 . Philadelphia's death rate was at its lowest in at least a half - century, 13,691 deaths in 2013 . Another factor attributing to the population increase is Philadelphia's immigration rate . In 2013, 12.7 percent of residents were foreign - born, just shy of the national average, 13.1 percent . </P> <P> Irish, Italian, German, Polish, English, Russian, Ukrainian and French are the largest ethnic European groups in the city . Philadelphia has the second - largest Irish and Italian populations in the United States, after New York City . South Philadelphia remains one of the largest Italian neighborhoods in the country and is home to the Italian Market . The Pennsport neighborhood and Gray's Ferry section of South Philadelphia, home to many Mummer clubs, are well known as Irish neighborhoods . The Kensington, Port Richmond, and Fishtown neighborhoods have historically been heavily Irish and Polish . Port Richmond is well known in particular as the center of the Polish immigrant and Polish - American community in Philadelphia, and it remains a common destination for Polish immigrants . Northeast Philadelphia, although known for its Irish and Irish - American population, is also home to a large Jewish and Russian population . Mount Airy in Northwest Philadelphia also contains a large Jewish community, while nearby Chestnut Hill is historically known as an Anglo - Saxon Protestant community . </P> <P> Philadelphia is also home to a significant gay and lesbian population . Philadelphia's Gayborhood, which is located near Washington Square, is home to a large concentration of gay and lesbian friendly businesses, restaurants, and bars . </P> <P> The Black American population in Philadelphia is the third - largest in the country, after New York City and Chicago . Historically, West Philadelphia and North Philadelphia were largely black neighborhoods, but many are leaving those areas in favor of the Northeast and Southwest sections of Philadelphia . There is a higher proportion of Muslims in the Black American population than most cities in America . West Philadelphia also has significant Caribbean and African immigrant populations . </P>

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