About 2.6 million people live in Queens and it is the largest borough of New York City in size and second in population. According to the United States census, Queens is the most ethnically diverse county in the USA. That means that it has the most people from different kinds of places, religions, and ethnic groups of any place in the USA. Large parts of Queens are urban and an equal part is suburban. Until 1899 Nassau County, New York was part of Queens County.