Question: What is the population of the borough that contains the neighborhood of Riverdale?

Knowledge 1: New York City
The character of New York's large residential districts is often defined by the elegant brownstone rowhouses and townhouses and shabby tenements that were built during a period of rapid expansion from 1870 to 1930. In contrast, New York City also has neighborhoods that are less densely populated and feature free-standing dwellings. In neighborhoods such as Riverdale (in the Bronx), Ditmas Park (in Brooklyn), and Douglaston (in Queens), large single-family homes are common in various architectural styles such as Tudor Revival and Victorian. [SEP] Knowledge 2: The Bronx
The Bronx /ˈbrɒŋks/ is the northernmost of the five boroughs (counties) of New York City in the state of New York, located south of Westchester County. Many bridges and tunnels link the Bronx to the island and borough of Manhattan to the west over and under the narrow Harlem River, as well as three longer bridges south over the East River to the borough of Queens. Of the five boroughs, the Bronx is the only one on the U.S. mainland and, with a land area of 42 square miles (109 km2) and a population of 1,438,159 in 2014, has the fourth largest land area, the fourth highest population, and the third-highest population density.
Knowledge 1: New York City
The character of New York's large residential districts is often defined by the elegant brownstone rowhouses and townhouses and shabby tenements that were built during a period of rapid expansion from 1870 to 1930. In contrast, New York City also has neighborhoods that are less densely populated and feature free-standing dwellings. In neighborhoods such as Riverdale (in the Bronx), Ditmas Park (in Brooklyn), and Douglaston (in Queens), large single-family homes are common in various architectural styles such as Tudor Revival and Victorian. [SEP] Knowledge 2: Queensboro Bridge
The Queensboro Bridge, also known as the 59th Street Bridge – because its Manhattan end is located between 59th and 60th Streets – and officially titled the Ed Koch Queensboro Bridge, is a cantilever bridge over the East River in New York City that was completed in 1909. It connects the neighborhood of Long Island City in the borough of Queens with the neighborhood of Upper East Side in Manhattan, passing over Roosevelt Island.
Knowledge 1: New York City
The character of New York's large residential districts is often defined by the elegant brownstone rowhouses and townhouses and shabby tenements that were built during a period of rapid expansion from 1870 to 1930. In contrast, New York City also has neighborhoods that are less densely populated and feature free-standing dwellings. In neighborhoods such as Riverdale (in the Bronx), Ditmas Park (in Brooklyn), and Douglaston (in Queens), large single-family homes are common in various architectural styles such as Tudor Revival and Victorian. [SEP] Knowledge 2: New York City
There are hundreds of distinct neighborhoods throughout the five boroughs of New York City, many with a definable history and character to call their own. If the boroughs were each independent cities, four of the boroughs (Brooklyn, Queens, Manhattan, and the Bronx) would be among the ten most populous cities in the United States.

Answer: 1,438,159