Question: Which borough of New York City is the most densely populated and home of Marble Hill: Queens or Manhattan? 
Context: North American area codes 718, 347, and 929 are New York City telephone area codes in the boroughs of The Bronx, Brooklyn, Queens, and Staten Island, as well as the Marble Hill section of Manhattan.  They are overlaid by area code 917, which covers the entirety of New York City. The Broadway Bridge in New York City crosses the Harlem River Ship Canal between Inwood on Manhattan Island and Marble Hill, also originally part of the island, but separated from it by the ship canal; it is still part of the borough of Manhattan.  The bridge is named because it carries Broadway, which is designated as US 9 here.  The bridge also carries the IRT Broadway – Seventh Avenue Line ( trains ) above the road. Marble Hill is the northernmost neighborhood in the New York City borough of Manhattan.  It is the only Manhattan neighborhood on the mainland of North America.  Marble Hill was occupied as a Dutch colonial settlement in 1646, and gained its current name in 1891 because of marble deposits underneath the neighborhood. The Bronx ( ) is the northernmost of the five boroughs of New York City, within the U.S. state of New York.  It is geographically south of Westchester County; north and east of the island and borough of Manhattan to the south and west across the Harlem River; and north of the borough of Queens, across the East River.  Of the five boroughs, the Bronx is the only one that has the majority of its area on the U.S. mainland and, with a land area of 42 sqmi and a population of 1,455,720 in 2016, has the fourth-largest land area, the fourth-highest population, and the third-highest population density.  Since 1914, the Bronx has had the same boundaries as Bronx County, a county of New York and the third most densely populated county in the United States. Tuckahoe marble (also known as Inwood marble) is a type of marble named after the village of Tuckahoe, New York or alternatively the neighborhood of Inwood in Manhattan, New York City.  It is found in Eastchester and extending southward to parts of the Bronx, such as Kingsbridge, Mott Haven, Melrose and Tremont and Marble Hill.  It has long been quarried at Tuckahoe as well as at other locations in Westchester County, including Ossining, Hastings, and Thornwood, hence the alternate name, Westchester marble.  It is part of the Inwood Formation, which also intrudes into western Connecticut.  It dates from the Late Cambrian to the Early Ordovician ages (~484 ma ago). Manhattanization is a neologism coined to describe the construction of many tall or densely situated buildings, which transforms the appearance and character of a city to resemble Manhattan, a heavily and densely populated borough of New York City.  It was a pejorative word used by critics of the highrise buildings built in San Francisco during the 1960s and 1970s, who claimed the skyscrapers would block views of the bay and the surrounding hills.  With careful urban planning, the phenomenon became more accepted in time.  The term also gained usage as a buzzword for high-density developments in Las Vegas, Nevada, Los Angeles, Dubai, and Miami in the early 2000s and again in the 2010s.  Another example is the construction boom in Toronto since 2007.  The term has even been applied to many smaller US cities that have seen a large spike in downtown high rise rental buildings since the year 2000.  Nonetheless, these cities would have to multiply their populations many times over to match the population density of Manhattan, though this is a biased comparison between a city and a district, as even the other four "outer boroughs" of New York City would have to nearly triple in population to match Manhattan's current density.  Likewise, the just over 1 sqmi Brickell (Miami) financial district is more dense than New York City overall. Brooklyn ( ) is the most populous borough of New York City, with a Census-estimated 2,629,150 residents in 2016.  It borders the borough of Queens at the southwestern end of Long Island, and has several bridge connections to the nearby boroughs of Staten Island and Manhattan.  Since 1896, Brooklyn has had the same boundaries as Kings County, the most populous county in the U.S. state of New York and the second-most densely populated county in the United States, after the county of New York (which is coextensive with the borough of Manhattan). Queens is the easternmost and largest in area of the five boroughs of New York City.  It is geographically adjacent to the borough of Brooklyn at the southwestern end of Long Island, and to Nassau County farther east on Long Island; in addition, Queens shares water borders with the boroughs of Manhattan and the Bronx.  Coterminous with Queens County since 1899, the borough of Queens is the second-largest in population (after Brooklyn), with a census-estimated 2,333,054 residents in 2016, approximately 48% of them foreign-born.  Queens County also is the second-most populous county in the U.S. state of New York, behind the neighboring borough of Brooklyn, which is coterminous with Kings County.  Queens is the fourth-most densely populated county among New York City's boroughs, as well as in the United States.  If each of New York City's boroughs were an independent city, Queens also would be the nation's fourth most populous, after Los Angeles, Chicago, and Brooklyn.  Queens is the most ethnically diverse urban area in the world. John F. Kennedy High School is a former four-year comprehensive New York City public high school, located at 99 Terrace View Avenue along the border of the Spuyten Duyvil section of the Bronx and the Marble Hill neighborhood of Manhattan, near the Kingsbridge section of the Bronx.  The building currently operates as John F. Kennedy Educational Campus, housing four small public high schools and two charter high schools.  The campus serves grades 9–12 and is operated by the New York City Department of Education. Manhattan ( , ) is the most densely populated borough of New York City, its economic and administrative center, and its historical birthplace.  Locally it is often referred to simply as "The City".  The borough is coextensive with New York County, founded on November 1, 1683, as one of the original counties of the U.S. state of New York.  The borough consists mostly of Manhattan Island, bounded by the Hudson, East, and Harlem rivers; several small adjacent islands; and Marble Hill, a small neighborhood now on the U.S. mainland, physically connected to the Bronx and separated from the rest of Manhattan by the Harlem River.
Answer: Manhattan