New York City is 3.7 times larger than Baltimore.
Area: 212 km2 calculated
Baltimore is the largest city in the U.S. state of Maryland and the 26th-most populous city in the country. It is located in the central area of the state along the tidal portion of the Patapsco River, an arm of the Chesapeake Bay. Wikipedia
Area: 784 km2 calculated
New York is the most populous city in the United States and the center of the New York metropolitan area, the premier gateway for legal immigration to the United States and one of the most populous urban agglomerations in the world. Wikipedia