 Presently, the city has some of the largest Irish, Italian, German, Polish, Puerto Rican, Korean, Vietnamese, Russian, Ukrainian, Jamaican, Chinese, Arab, Thai, and Cambodian populations in America.The county has the fourth largest concentration of African Americans in North America, including large numbers of Liberians, Nigerians, and Sudanese.The Northeast section of the city, and more significantly the suburbs of Philadelphia, contain large numbers of Indian Americans and Mexicans.