Since 2000, the number of young children living in parts of Lower Manhattan has nearly doubled. The poverty rate declined in all but one New York City neighborhood. A majority of Bronx residents are Hispanic.

And the number of white people living in Harlem more than tripled, helping to drive up median household income there by nearly 20 percent — the fourth-highest jump in the city.

Those are some of the more striking trends revealed in new census figures that produce the most detailed snapshot of New York City neighborhoods and of the metropolitan area’s smaller cities and towns since the 2000 census.