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Immigration and cultural diversity

In addition to the city's economic growth, the city's population has been fueled by foreign immigration. According to The Pew Charitable Trusts, the city's foreign-born population increased by 69% between 2000 and 2016 to constitute nearly 20% of Philadelphia's workforce, and it doubled between 1990 and 2017 to constitute 13.8% of the city's total population, with the top five countries of origin being China by a significant margin followed by the Dominican Republic, Jamaica, India, and Vietnam.

Irish, Italian, German, Polish, English, Russian, Ukrainian, and French ancestries constitute the largest European ethnic 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 a center for the 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 home to a Jewish and Russian population. Mount Airy in Northwest Philadelphia also contains a Jewish community. Nearby Chestnut Hill is historically known as an Anglo-Saxon Protestant community.

Philadelphia's Black American population is the fourth-largest in the country after New York City, Chicago, and Houston. West Philadelphia and North Philadelphia are largely African-American neighborhoods, but many are leaving those areas in favor of the Northeast and Southwest sections of Philadelphia. A higher proportion of African-American Muslims reside in Philadelphia than most other major U.S. cities. West Philadelphia and Southwest Philadelphia are home to various Afro-Caribbean and African immigrant communities.

The Puerto Rican population in Philadelphia is the second-largest on the U.S. mainland after New York City, and the second-fastest growing after Orlando. Eastern North Philadelphia, particularly Fairhill and surrounding areas to the north and east, has one of the highest concentrations of Puerto Ricans outside Puerto Rico, with many large swaths of blocks being close to 100% Puerto Rican. Puerto Rican and Dominican populations reside in North Philadelphia and the Northeast, and Mexican and Central American populations exist in South Philadelphia. South American migrants were being transported by bus from Texas to Philadelphia beginning in 2022.

Philadelphia's Asian American population includes those of Chinese, Indians, Vietnamese, South Koreans, Filipinos, Cambodians, and Indonesians. Over 35,000 Chinese Americans lived in the city in 2015, including a Fuzhounese population. Center City hosts a Chinatown that is served by Chinatown bus lines with service to/from Chinatown, Manhattan. A Korean community initially settled in the North Philadelphia neighborhood of Olney; however, the primary Koreatown has subsequently shifted further north, straddling the city's border with adjacent Cheltenham in Montgomery County and Cherry Hill in South Jersey. South Philadelphia is home to Vietnamese-Americans in Little Saigon and Cambodian-Americans in Cambodia Town, as well as Thai-American, Indonesian-American, and Chinese-American communities.

Philadelphia's Gay village near Washington Square is home to a concentration of gay and lesbian-friendly businesses, restaurants, and bars.