largest counties. Among young adults in New York who work full-time, women now earn more money than men — approximately $5,000 more in 2005. New York City's borough of Manhattan is the highest nominal income county in the United States. In particular, ZIP code 10021 on Manhattan's Upper East Side, with more than 100,000 inhabitants and a per capita income of over $90,000, has one of the largest concentrations of income in the United States. The other boroughs, especially Queens and Staten Island, have large middle-class populations. New York City's per capita income in 2000 was $22,402; men and women had a median income of $37,435 and $32,949 respectively. 21.2% of the population and 18.5% of families had incomes below the federal poverty line; 30.0% of this group were under the age of 18 and 17.8% were 65 and older. Of Forbes Magazine's 400 richest American billionaires, 70 live in New York City. Former mayor and Presidential candidate Michael Bloomberg is one of the nation's richest men. As of 2009 New York has regained the number one spot as the city with most billionaires (55), after losing out to Moscow in 2008. Projections Neighborhood Tabulation Areas (NTAs) are a geographic unit created to help project populations at a small area level, as part of the long-term sustainability plan for the city known as PlaNYC, covering the years 2000–2030. The minimum population for an NTA is 15,000 people, a level seen as a useful summary level which can be used both with the 2010 Census and the American Community Survey. New York has ranked first in population among American cities since the first census in 1790. New York will maintain this position for the foreseeable future, although there are varying forecasts on how much the population will increase. The most realistic population projections from the Department of City Planning anticipate a 1.1 million increase by 2030, bringing the city's population total to 9.1 million. While the city's projected 2030 population will be a new high, only two boroughs, Staten Island and Queens have reached their population peak every year for the last 5 years. The study projects that by 2030, Queens will have 2.57 million people and Staten Island 552,000. Manhattan, with 1.83 million, Bronx with 1.46 million and Brooklyn with 2.72 million, will still be below their population peaks. Disputed 2010 Census data On March 27, 2011, New York City